Seiko N855 User Manual

N855

Bluetooth Link Watch

INSTRUCTION MANUAL

Thank you very much for choosing a SEIKO watch.

For proper and safe use of your SEIKO watch,

please read carefully the instructions in this

booklet before using it.

Keep this manual handy for easy reference.

Length adjustment service for metallic bands is available

※

at the retailer from whom the watch was purchased. If you
cannot have your watch repaired by the retailer from whom
the watch was purchased because you received the watch as
a gift or you moved to a distant place, please contact SEIKO
CUSTOMER SERVICE CENTER.

The service may also be available on a chargeable basis at
other retailers, however, some retailers may not undertake
the service.

If your watch has a protective lm for preventing scratches,

※

make sure to peel it off before using the watch. If the watch
is used with the lm on it, dirt, sweat, dust, or moisture may
be attached to the lm and may cause rust.

1

CONTENTS

1. ABOUT THIS PRODUCT

Handling Precautions ………………………………………………… 3



About the Radio Act ………………………………………………… 5
About the Radio Act ……………………………………………… 5
About Radio Frequency ………………………………………… 5
Cautions for Use of 2.4 GHz Equipment ……………………… 5
Use of Bluetooth Communication Function of the Watch

outside Japan …………………………………………………… 5
About Bluetooth
Specications of Bluetooth …………………………………… 8
Caution for Use of Bluetooth Connection …………………… 8
License and Trademark ………………………………………… 8
Features ………………………………………………………………… 9
Names of Parts ………………………………………………………… 9
Functions of Each Mode ……………………………………………… 10

Ⓡ

…………………………………………………… 8

2. TIME SYNCHRONIZATION VIA BLUETOOTH COMMUNICATION

Registration of Watch ………………………………………………… 11



Precautions on Using Time Synchronization Function
via Bluetooth Communication ………………………………… 11
Before Registering the Watch ………………………………… 11

To Start Registration …………………………………………… 11
How to Receive Time/Calendar Data ………………………………12
Automatic Reception ……………………………………………12
Manual Reception ………………………………………………12
Display of Reception Result ……………………………………13

3. MANUAL TIME ADJUSTMENT FUNCTION OF TIME MODE

How to Adjust Time Manually ……………………………………… 14



Operation Method ……………………………………………… 14

4. CALENDAR FUNCTION

How to Show Calendar Display ……………………………………15
Calendar Display …………………………………………………15
Operation Method ………………………………………………15
How to Adjust Calendar Manually …………………………………16
Operation Method ………………………………………………16

5. COUNT-UP TIMER

How to Use Count-Up Timer …………………………………………17
Operation Method ………………………………………………17

6. HAND POSITION ADJUSTMENT

How to Adjust Hand Position ……………………………………… 18
Operation Method ………………………………………………18

7. TO PRESERVE THE QUALITY OF YOUR WATCH

Daily Care ……………………………………………………………… 19
Performance and Type ………………………………………………19
Water Resistance ………………………………………………………20
Band ……………………………………………………………………21
Remarks on Battery ……………………………………………………22
After-Sales Service ……………………………………………………23

8. TROUBLESHOOTING

Troubleshooting ……………………………………………………… 24
How to Reset Built-In IC (System Reset) …………………………27
Operation Method ………………………………………………27

9. SPECIFICATIONS

Specications …………………………………………………………28

22

1. ABOUT THIS PRODUCT

Handling Precautions (1)

WARNING

To indicate the risks of serious consequences such as
severe injuries unless the following safety regulations
are strictly observed.

Immediately stop wearing the watch in the following cases.

・

If the watch body or band becomes edged by corrosion, etc.

○



○If the pins protrude from the band

Immediately consult the retailer from whom the watch was

※

purchased or SEIKO CUSTOMER SERVICE CENTER.

Keep the watch and accessories out of the reach of babies and children.

・

Care should be taken to prevent a baby or a child from accidentally





swallowing accessories.
If a baby or a child swallows the battery or accessories, immediately
consult a doctor as it will be harmful to the health of the baby or child.

Do not remove the battery from the watch.

・

Replacement of the battery requires professional knowledge and
skill. For battery replacement, please ask the retailer from whom
the watch was purchased .

Do not charge the batter y.

It may explode, generate heat or catch re.

CAUTION

To indicate the risks of light injuries or material damage
unless the following safety regulations are strictly observed.

Avoid wearing or storing the watch in the following places.

・

Places where volatile agents (such as polish remover, bug

 ○

repellent, thinners, etc.) are vaporizing
Places where the temperature drops below 5 ℃ or rises above 35

○

for a long time

℃

Places of high humidity

○

or static electricity
Dust y places

○

Do not leave the old battery inside the watch for a long time.

※

Battery leakage may occur.

If you observe any allergic symptoms or skin irritation,

・

Stop wearing the watch immediately and consult a specialist
such as a dermatologist or an allergist.

Other cautions

・



Replacement of the metal band requires professional

○

knowledge and skill. Please ask the retailer from whom the
watch was purchased for replacement of the metal band, as
there is a risk of hand or nger injury and fear of losing parts.
Do not disassemble or tamper with the watch.

○

Keep the watch out of the reach of babies and children. Extra

○

care should be taken to avoid risks of any injury or allergic rash
or itching that may be caused when they touch the watch.

○ When disposing of used batteries, follow the instructions of

your local authorities.
If your watch is of the fob or pendant type, the strap or chain

○

attached to the watch may damage your clothes, or injure the
hand, neck, or other parts of your body.

Places affected by strong vibrations

○

Places affec ted by strong magnetism

○

3

1. ABOUT THIS PRODUCT

Handling Precautions (2)

WARNING

Do not use the watch for scuba diving or saturation diving.

The various tightened inspections under simulated
harsh environment, which are usually required for
watches designed for scuba diving or saturation
diving, have not been conducted on this watch. For
diving, use special watches for diving.

The radio waves emitted from this product may have
a negative impact and cause an accident due to a
malfunction.

Do not use this product near medical equipment.

・

The radio waves may affect pacemakers and
electric medical equipment . Do not use it in
crowded places such as packed trains, and inside
of medical institutions.

Do not use this product near automatic control devices

・

such as automatic doors and re alarm systems.

In the places where transmission of radio waves
is prohibited, such as in airplanes, turn off the
automatic reception function of the watch, and do
not perform manual reception.

The radio waves emitted from this product may
adversely affect other devices.

CAUTION

Do not pour running water directly from faucet onto
the watch.

The water pressure of tap water from a faucet is high
enough to degrade the water resistant per formance of
a water resistant watch for everyday life.

Do not push the buttons when the watch is wet.

Water may get inside of the watch.

If the inner surface of the glass is clouded with

※

condensation or water droplets appear inside of the
watch for a long time, the water resistant performance
of the watch is deteriorated. Immediately consult the
retailer from whom the watch was purchased or SEIKO
CUSTOMER SERVICE CENTER .

Do not leave moisture, sweat and dirt on the watch
for a long time.

Be aware of a risk that a water resistant watch may
lessen its water resistant performance because of
deterioration of the adhesive on the glass or gasket, or
the development of rust on stainless steel.

Do not wear the watch while taking a bath or a
sauna.

Steam, soap or some components of a hot spring
may accelerate the deterioration of water resistant
performance of the watch.

4

1. ABOUT THIS PRODUCT

About the Radio Act (1)

About the Radio Act

■

This product is certified as a
low power data communication
system based on the Radio Act in
Japan.
It is not necessary to obtain a
license, etc., to use this product
in Japan.
It is illegal to disassemble and
modify this product.

About Radio frequency

■

The frequency used by this product may be used also by other
wireless equipment. To prevent radio wave interference with other
radio equipment, be careful about the following when using this
product.

This radio product uses the

2.4 GHz band. As a modulation
method, the GFSK modulation
method is adopted, and the
interference distance is 10 m.



[Certication No.]

(

N85

001-A

)

15298

■Cautions for Use of 2.4 GHz Equipment

The operation frequency of this product is 2.4 GHz band.
In this frequency band, besides industrial/scientic/medical equipment
such as microwave ovens, other similar radio stations, in-plant radio
stations for mobile object identication that require licenses used for
manufacturing lines, etc., of plants, specic low power radio stations
that do not require licenses, amateur radio stations, etc. (hereinafter
referred to as "other radio stations") are operated.

・ Before using this product, make sure that "other radio stations" are

not operating nearby.

　・ If radio wave interference occurs between this product and "other

radio stations", change the location in which this product is used or
stop using this product (stop emitting radio waves) immediately.

　・ If you have any questions or troubles, please contact the SEIKO

CUSTOMER SERVICE CENTER.

Use of Bluetooth Communication Function of

■

the Watch outside Japan

This watch connects with a smartphone using the Bluetooth wireless
technology to perform time synchronization. To use its Bluetooth
function in countries or regions outside Japan, the watch must be
certied by the radio law thereof. Use of the function in a country or
region where such certication has not been obtained may subject the
user to punishment.

Use of the Bluetooth function of the watch other than the following
countries and regions may be illegal (as of November 2019).

Japan, U. S. A., Canada, Australia, New Zealand, Korea, Belgium,
Bulgaria, Czech, Denmark, Germany, Estonia, Ireland, Greece,
Spain, France, Croatia, Italy, Cyprus, Latvia, Lithuania, Luxembourg,
Hungary, Malta, the Netherlands, Austria, Poland, Portugal,
Rumania, Slovenia, Slovakia, Finland, Sweden, U. K., Turkey,
Norway, Iceland, Liechtenstein, Hong Kong, Macau, Ecuador,
Colombia, Vietnam, and Peru

When the watch is used in countries or regions other than those
above, turn off the automatic reception function, and refrain from
using the manual reception function.
For details, visit our website: https://www.seikowatches.com/jp-ja/
customerservice/bluetooth

5

1. ABOUT THIS PRODUCT

About the Radio Act (2)

REGULATORY COMPLIANCE/ CONFORMITÉ RÉGLEMENTAIRE/

USA

●

FCC Notice

This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions:

(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including

interference that may cause undesired operation.

FCC Caution

Changes or modications not expressly approved by the party
responsible for compliance could void the user's authority to
operate the equipment.
This transmitter must not be co-located or operated in conjunction
with any other antenna or transmitter.

Canada

●

IC Notice

This device complies with Industry Canada's applicable licence­exempt RSSs. Operation is subject to the following two conditions:
(1) This device may not cause interference; and
(2) This device must accept any interference, including interference

that may cause undesired operation of the device.

EU

●

대한민국

●

Australia

●

규정 준수

This product is in compliance with the essential
requirements and other relevant provisions of the
RE Directive (2014/53/EU) & RoHS Directive (2011/65/
EU).

https://www.seikowatches.com/global-en/products/
declaration-conformity

・등록번호 :R-C-skW-N851
・신청자 :SEIKOWATCHCORPORATION
・제조자 :SEIKOWATCHCORPORATION
・제품명 :Bluetoothwatch
・모델명 :N851,N855
・제조년월 :구입처에문의해주십시오
・제조국 :중국

IC Avis

Le présent appareil est conforme aux CNR d'Industrie Canada
applicables aux appareils radio exempts de licence. L'exploitation
est autorisée aux deux conditions suivantes:
(1) l'appareil ne doit pas produire de brouillage;
(2) l'utilisateur de l'appareil doit accepter tout brouillage

radioélectrique subi, même si le brouillage est susceptible d'en
compromettre le fonctionnement.

6

New Zealand

●

R-NZ

1. ABOUT THIS PRODUCT

About the Radio Act (3)

REGULATORY COMPLIANCE FOR USA/CANADA

Caution: The user is cautioned that changes or modications not expressly

approved by the party responsible for compliance could void
the user's authority to operate the equipment.

This device complies with Part 15 of the FCC Rules and Industry Canada
licence-exempt RSS standard(s). Operation is subject to the following
two conditions:

(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including

interference that may cause undesired operation.

Le présent appareil est conforme aux CNR d'Industrie Canada applicables
aux appareils radio exempts de licence. L'exploitation est autorisée aux
deux conditions suivantes:

(1) l'appareil ne doit pas produire de brouillage, et
(2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique

subi, même si le brouillage est susceptible d'en compromettre le
fonctionnement.

NOTE: This equipment has been tested and found to comply with the

limits for a Class B digital device, pursuant to Part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy
and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur
in a particular installation.

If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:

FCC & IC Radiation Exposure Statement:

This equipment complies with FCC and Canada radiation exposure limits
set forth for an uncontrolled environment.
This transmitter must not be co-located or operating in conjunction with
any other antenna or transmitter.

Déclaration d'IC sur l'exposition aux radiations:

Cet équipement est conforme aux limites d'exposition aux radiations
dénies par le Canada pour des environnements non contrôlés.
Cet émetteur ne doit pas être installé au même endroit ni utilisé avec
une autre antenne ou un autre émetteur.

Reorient or relocate the receiving antenna.

・

Increase the separation between the equipment and receiver.

・

Connect the equipment into an outlet on a circuit different

・

from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for

・

help.

7

1. ABOUT THIS PRODUCT

About Bluetooth

Specications of Bluetooth

■

Communication method: Bluetooth Standard Ver. 5.0

・

Frequency band used: 2.4 GHz band (2,402 to 2,480 MHz)

・

Modulation method: GFSK (1 MHz)

・

Caution for Use of Bluetooth Connection

■

The range in which the Bluetooth connection of this product is

・

possible varies depending on obstacles (human bodies, metal,
walls, etc.) and the surrounding radio wave state.
Under the following conditions, the Bluetooth connection may take
a long time or a connection error may occur.

Places where a wireless LAN exists;
Around microwave ovens in use; and
When other products with a communication function are used.

In such cases, data sending/receiving may fail, however, it is not a
malfunction.
Use the product in other environment.

The radio waves emitted by this product may affect operations of

・

electronic medical equipment, etc.

In some cases, this may lead to serious accidents. Therefore, avoid
Bluetooth connections in the following places:

Hospitals; near priority seats in trains; airplanes; places such as
gas stations where flammable gas is generated; near automatic
doors; and re alarm systems.

Ⓡ

License and Trademark

■

BluetoothⓇ is a trademark or registered trademark of Bluetooth SIG,
Inc.
Seiko Watch Corporation uses this logo mark under license.

Note that we are not liable for any information leakage that may

・

occur with the Bluetooth connection.

8

1. ABOUT THIS PRODUCT

Features

Your watch is a Bluetooth® Link Watch that corrects the time
automatically by connecting with a smartphone using the dedicated
application Time Connect※.
To transmit data between the watch and the smartphone, make sure
that the smartphone is installed with Time Connect.
In addition to the time display function, the watch is equipped with
perpetual calendar and count-up timer functions.

Time Synchronization via Bluetooth Communication

■

Time data is transmitted between the watch and the dedicated
application via Bluetooth communication to correct the time/calendar
of the watch. The data can be received either automatically or
manually as required by operating the button or the rotary switch.
The watch indicates whether the reception has succeeded or failed.

Mode Change with Rotary Switch

■

Mode change can be made easily by turning the rotating bezel. You
can see at a glance which mode is currently in use.

Perpetual Calendar

■

Month and date are indicated by the hands. The calendar adjusts
automatically for odd and even months including February of leap
years up to February 28, 2100.

Names of Parts

Hour hand

Button

Mode indicator

Mode name:

COUNT-UP
TIME
CONNECT

The markings on the bezels and the design of the watch may

※

differ from model to model.

Rotary Switch

●

Ⓐ

Fixed bezel

Rotating bezel

Second hand

Minute hand

Reception result
(Y, N)

Button

Date scale

Ⓑ

Count-Up Timer

■

Up to 12 hours can be measured. When the time measured reaches



12 hours, the timer stops counting automatically.

Battery Life Indicator

■

When the battery nears its end, the second hand starts moving at 2-second
intervals to warn that it needs to be replaced with a new one immediately.

Time Connect supports the following OSs (as of November 2019).

※

iOS 11 or later

・

Android Ver. 7 or later

　・

For the latest information on the supported OS, please visit our website below:

https://www.seikowatches.com/jp-ja/customerservice/bluetooth

9

To change the mode, turn the rotating bezel to align the mode

・

indicator on the rotating bezel with the desired mode name
(CONNECT, TIME or COUNT-UP) on the xed bezel.

The rotating bezel can be turned either clockwise or counterclockwise

・

between CONNECT and COUNT-UP.

CAUTION

【

If sand or dirt enters the clearance between the rotating bezel and the
watch case, the rotating bezel may not turn smoothly. If the watch is
soiled with such foreign matter, rinse it off completely in a container
of tap water.

】

1. ABOUT THIS PRODUCT

Functions of Each Mode

To change mode, turn the rotating bezel to align the mode indicator with a desired mode nameon the xed bezel.

●

COUNT-UP mode

TIME mode

Mode indicator

CONNECT mode

COUNT-UP

Mode indicator

TIME

CONNECT

Mode indicator

Measurement of elapsed time with count-up timer (P. 1 7 )

■

Time display

■

Calendar display (P. 1 5 )

■

Display of reception result (P. 1 3 )

■

Manual time synchronization via Bluetooth communication (P. 1 2 )

■

Time setting with watch buttons (P. 1 4 )

■

Calendar setting with watch buttons (P. 1 6 )

■

Hand position adjustment with watch buttons (P. 1 8 )

■

Time display

■ 

Calendar display (P. 1 5 )

■ 

Display of reception result (P. 1 3 )

■ 

Automatic time synchronization via Bluetooth communication

■

(P. 1 2 )

Manual time synchronization via Bluetooth communication (P. 1 2 )

■ 

Calendar setting with watch buttons (P. 1 6 )

■ 

10

2. TIME SYNCHRONIZATION VIA BLUETOOTH COMMUNICATION

Registration of Watch

To Start Registration

Precautions on Using Time Synchronization

■

Function via Bluetooth Communication

When using the time synchronization function via Bluetooth
communication, please observe the following:

CAUTION

Keep the dedicated application running at all times.

※

Keep your smartphone within 3 meters from the watch.

※

In the places where use of radio waves is prohibited, such as in

※

airplanes and hospitals, turn off the automatic reception function
of the watch, and do not perform manual reception.

Your watch is compliant with or certified by the radio law of

※

various countries and regions. Use of it in areas other than those
may be illegal and subject you to punishment. (Refer to P. 5 .)

Before using the watch with a smartphone for therst time, be sure

●

to register it to the dedicated application. Registration procedure is no
longer required for Bluetooth communication thereafter.

■



Turn the rotating bezel to align the mode indicator with



①

"CONNECT," or press and hold the button at the 3 o’clock position
for more than 2 seconds while the time is displayed in TIME or
CONNECT mode. The second hand points to the 3 o’clock position.

By turning the rotating bezel to change the mode to CONNECT

※

from any other mode, the communication starts automatically.

[ Change the mode to CONNECT

from any other mode. ]

or

[ Press and hold Button Ⓑ for

more than 2 seconds ]

Button

Ⓑ

Press and
hold for
more than
2 seconds

Before Registering the Watch

■

For the information on downloading and installation of the

●

dedicated application "Time Connect," refer to the "Application
Operating Guide for N8 Series Watches".

https://www.seikowatches.com/jp-ja/customerservice/bluetooth)

（

1. Enable the Bluetooth function on the smartphone.

The method of enabling the Bluetooth function differs

※

depending on the model of the smartphone. For details, please
refer to the instruction manual for your smartphone.

2. Start up the dedicated application "Time Connect."
While registering the watch, make sure that the application screen

is kept displayed on the smartphone.

11

Check that the registration of the watch is completed successfully.





②

When the watch connects with the application of the smartphone,

"Watch registered" is shown on the application screen, indicating
that the watch has been successfully registered to the application.

Each time the watch is used with a new smartphone, be sure to
install the dedicated application on the smartphone, and follow the
procedure in “Registration of Watch” above.

2. TIME SYNCHRONIZATION VIA BLUETOOTH COMMUNICATION

How to Receive Time/Calendar Data (1)

Automatic Reception

■

Turn the rotating bezel to align the mode indicator with "CONNECT,"



and keep the watch in the CONNECT mode.

Rotating bezel

"CONNECT"

Mode indicator

The watch automatically receives the time data once in 24 hours

※

at the same time of day when the time synchronization was
performed previously.

If the time of automatic reception comes while the calendar is

※

displayed (see P. 15), the display returns to the time, and then, the
data transmission starts. If it comes while the calendar is adjusted
manually (see P. 16), the automatic reception is performed after
the manual adjustment is completed.

If the rotating bezel is turned while the communication is in

※

process, it is discontinued.
While the watch is on standby for automatic reception in

※

CONNECT mode, the current time is displayed.

Manual Reception

■

The manual reception can be

●



[ 1 ]　

[ 2 ]　

"CONNECT"

Turn the rotating bezel to change the mode to CONNECT

any other mode. The second hand points to the 3 o'clock
position as the communication starts.

Rotating bezel

"CONNECT"

Mode indicator

While the time is displayed in

and hold Button Ⓑfor more than 2 seconds. The second
hand points to the 3 o'clock position as the communication
starts.

performed in two ways:

from

Second hand

[ CONNECT mode ]

CONNECT or TIME mode, press

Second hand Second hand

"TIME"

Button

Ⓑ

Press and
hold for
more than
2 seconds

Button

Ⓑ

Press and
hold for
more than
2 seconds

12

[ CONNECT mode ] [ TIME mode ]

2. TIME SYNCHRONIZATION VIA BLUETOOTH COMMUNICATION

How to Receive Time/Calendar Data (2)

Display of Reception Result

■

After the communication was performed either automatically or

●

manually, the second hand indicates the reception result for 5 seconds.

[ When the reception was successful ]

When the data was received normally, the second hand points "Y"
at the 2 o'clock position.

"Y"

Press Button Ⓐwhile the time is displayed in CONNECT or TIME

●

mode. The second hand points to "Y" or "N" to indicate the result
of the last reception performed in the past 24 hours.

Button

Ⓐ

Button

Ⓐ

Second hand

[ When the reception failed ]

When the data reception failed, the second hand points "N" at the 4
o'clock position.

"N"

Second hand

If the reception failed, check the following before performing manual
reception again:

Is the smartphone kept within 3 meters from the watch?

・

Is the dedicated application on the smartphone kept running?

・

Is the watch registered to the dedicated application, and is the

・

application congured properly?

"CONNECT"

※

"TIME"

[ CONNECT mode ]

If no reception succeeded or no communication was performed
in the past 24 hours, the second hand points to "N."

[ TIME mode ]

13

3. MANUAL TIME ADJUSTMENT FUNCTION OF TIME MODE

How to Adjust Time Manually

If the time synchronization function of the watch via the Bluetooth communication cannot be used for some reason, such as you do not have the

●

smartphone at hand, or it runs out of battery, it is possible to adjust the time manually in TIME mode using the watch alone.

Second hand points to 11 o'clock position in AM period
Second hand points to 1 o'clock position in PM period

[ Time display in TIME mode ]

[ Minute hand setting ] [ Hour hand setting ]

Button

Press and hold
for more than
2 seconds

Mode indicator

"TIME"

Operation Method

■

Turn the rotating bezel to align the mode indicator with "TIME" to



①

change the mode to TIME.

Press and hold Button Ⓐfor more than 2 seconds to activate the

②

manual time setting function.
The minute hand moves to the "0 second" position of the minute

next to the one currently displayed, and the second hand points
to the 11 or 1 o'clock position. Then, the minute hand moves to
indicate that it is ready for setting.

The second hand points to the 11 or 1 o'clock position depending

※

on whether the time is in the AM or PM period, respectively.

[ Ex.) If the time is 10:08 PM when the time setting function is activated ]

By pressing and holding Button Ⓐfor more than 2 seconds, the
hour and minute hands move to the positions indicating "10:09
oo," and the second hand points to the 1 o'clock position.

Press Button Ⓑto set the minute hand.

③

With each press of Button Ⓑ, the minute hand advances 1

※

minute. It moves quickly if the button is kept pressed.

Ⓐ

Button

Press and hold

Button

Ⓐ

Ⓐ

Button

Press to set
minute hand

Button Ⓐor returns automatically in 3 minutes

After the minute hand setting is completed, press Button Ⓐ.

④

The hour hand moves to indicate that it is ready for setting.

Press Button Ⓑ to set the hour hand.

⑤

※

※

After all the time setting procedure is completed, press Button Ⓐ in

⑥

accordance with a time signal. The time setting function is deactivated,
and the display returns to the time as the second hand starts counting
exactly from "0" second. If the watch is left untouched for 3 minutes,
or if the rotating bezel is turned to change the mode to another, the
time setting function is also deactivated, and the time you have set is
registered.

Ⓑ

Button

With each press of Button Ⓑ, the hour hand advances 1 hour. It

moves quickly if the button is kept pressed.
If the time period changes from AM to PM or vice versa by advancing

the hour and minute hands, the position the second hand points
to changes accordingly. The calendar display, however, will not
change even if the time is advanced from PM to AM period. To set the
calendar manually, use the calendar setting function (see P. 16).

Button

Ⓐ

Ⓐ

Button

Press to set
hour hand

Ⓑ

14

4. CALENDAR FUNCTION

How to Show Calendar Display

Calendar Display

■

The month and date are indicated by the analogue three hands.
The watch is equipped with a perpetual calendar function
that adjusts automatically for odd and even months including
February of leap years up to February 28, 2100

[ Time display in TIME mode ] [ Calendar display ]

.

Button

Ⓑ

Date scale
(on outer edge of dial)

Button

Mode indicator

"TIME"

Operation Method

■

Check that the mode indicator is aligned with "TIME" or



①

"CONNECT," and the current time is displayed.

If the mode is changed to “CONNECT” from another, the

※

current time is displayed after the time synchronization is
performed via Bluetooth communication (see P. 12). While the
communication is in process, the calendar will not be displayed
if the operation below is performed.

The illustration above refers to the case where the calendar is

displayed in TIME mode. The operation method and the calendar
display are the same in both TIME and CONNECT modes.

Ⓑ

Returns automatically

in 10 seconds

or

Button

Ⓑ



Hour and minute hands
(aligned together)
Indicating month
Ex.) August (8)

Press Button Ⓑ.

②

The hour and minute hands align together to indicate "month,"
while the second hand indicates "date." The calendar is
displayed for 10 seconds, and the display automatically returns
to the time.

Month: Read the hour marker that the hour and minute hands

point to.

Date: Read the date scale on the outer edge of the dial that

the second hand points to.

Pressing Button

※

the display to the time.

Ⓑ while the calendar is displayed also returns

Second hand
Indicating date
Ex.) 20th

15

4. CALENDAR FUNCTION

How to Adjust Calendar Manually

If the time synchronization function of the watch via the Bluetooth communication cannot be used, it is possible to adjust the calendar manually using

●

the watch alone.

Ex.) To set calendar to August 20, 2021

●

Button

[ Calendar display ] [ Date setting ] [ Month setting ] [ Leap year setting ]

Ⓐ

Button

Ⓐ

Hour hand (number of years elapsed from leap year)

Button

Ⓐ

Button

Ⓐ

Press and
hold for
more than
2 seconds

Hour and minute hands
Ex.) August (8)

Operation Method

■



Press Button Ⓑ in TIME or CONNECT mode to display calendar.

①

(Refer to P. 1 5 "How to Show Calendar Display.")

Press and hold Button Ⓐ for more than 2 seconds to activate the

②

calendar setting function.

The second and minute hands remain indicating "date" and "month,"
respectively, while the hour hand indicates the number of years elapsed
from the leap year ("1" in the example above). Then, the second hand
turns a full circle, indicating that it is ready for date setting.

Press Button Ⓑ to advance the second hand to set the desired date.

③

④
⑤

With each press of Button

※

moves quickly if the button is kept pressed.
If the date is advanced from "31st" to "1st," the month will not

※

be advanced by one.

After the date setting is completed, press Button Ⓐ.

The minute hand moves to indicate that it is ready for month setting.
Press Button Ⓑ to advance the minute hand to set the desired month.

With each press of Button

※

It moves quickly if the button is kept pressed.

Second hand
Ex.) 20th

Press and hold

Button

Ⓐ

Button Ⓐor returns automatically in 3 minutes

Ⓑ, the second hand advances 1 day. It

Ⓑ, the minute hand advances 1 month.

Button

Press to set
date
(1~31)

Ⓑ

Button

Ⓐ

Button

Ⓑ

Press to set
month
(1~12)

Button

If the month is advanced from "December (12)" to "January (1)," the

※

number of years elapsed from leap year will not be advanced by one.

After the month setting is completed, press Button Ⓐ.

⑥

The hour hand moves to indicate that it is ready for leap year setting.
Press Button Ⓑ to advance the hour hand to set the desired number

⑦

of years elapsed from leap year.

With each press of Button Ⓑ, the hour hand advances one year.

※

It moves quickly if the button is kept pressed.

After the leap year setting is completed, press Button Ⓐ. The

⑧

calendar setting function is deactivated, and the display returns
to the calendar. If the watch is left untouched for 3 minutes, or if
the rotating bezel is turned to change the mode to another, the
calendar setting function is also deactivated, and the calendar
you have set is registered.

When the display returns to the calendar, it returns to the time

※

in 10 seconds. The display also returns to the time by pressing
Button Ⓑ while the calendar is displayed.

Ⓐ

Button

Press to set
number of
years from
leap year
(0~3)

Ⓑ

Ex.)
2019 : 3
2020 : 0
2021 : 1
2022 : 2

16

5. COUNT-UP TIMER

How to Use Count-Up Timer

The count-up timer measures the elapsed time up to 12 hours. The hour, minute and second hands indicate "hour," "minutes" and "seconds" of the

●

elapsed time, respectively.

When 12 hours has elapsed, the count-up timer stops automatically.

Mode
indicator

To Start

measurement

"COUNT-UP"

Operation Method

■



Turn the rotating bezel to align the mode indicator with "COUNT-

①

UP." The count-up timer starts counting.

By pressing Button Ⓑ while the measurement is in progress,

②

the measurement stops

By pressing Button Ⓑ while the measurement is stopped,

③

measurement is restarted

The measurement can be stopped and restarted as many times

※

as necessary by pressing Button Ⓑ.
When the time measured reaches 12 hours, the count-up

※

timer stops automatically (auto-stop function), and all the
three hands stop at the 12 o'clock position. To restart the
measurement, press Button Ⓑ.

To reset the count-up timer, turn the rotating bezel to change the

④

mode to another. It is reset by doing so, irrespective of whether
the measurement is in progress or stopped.

.

.

Button

With each press of
Button Ⓑ, the timer
stops and restarts
alternately.

the

Ⓑ

[ Restart ][ Stop ][ Start of measurement ]

Button

Ⓑ

[ Reset ]

Turn the rotating
bezel to change mode
to another while the
timer is measuring or
stopped.

[ Auto-stop function]

Button

To restart
measurement

The count-up timer stops measurement
automatically when the time measured
reaches 12 hours. To restart the
measurement, press Button Ⓑ.

Ⓑ

17

6. HAND POSITION ADJUSTMENT

How to Adjust Hand Position

In the following cases, the hand position data stored in the built-in IC and the positions the hands actually point to do not correspond with each other.

●

Follow the procedure below to adjust the hand position.

1)The hands do not point to the proper positions, being affected by strong shocks, magnetism, etc.;

2)The hands do not indicate the time properly after the time synchronization via Bluetooth communication; and

3) After Bluetooth communication, the second hand does not indicate the reception result, "Y" or "N," properly.

[ Time display in TIME mode ]

Button

Press and
hold for
more than
10 seconds

Ⓐ

[ Second hand position

adjustment ]

Button

Ⓐ

Button

Button

Ⓑ

Press to set
second hand

[ Minute hand position

adjustment ]

Ⓐ

Button

Press to set
minute hand

[ Hour hand position

adjustment ]

Button

Ⓑ

Ⓐ

Button

Press to set
hour hand

Ⓑ

Mode
indicator

"TIME"

Operation Method

■



Press and hold Button Ⓐ for more than 10 seconds in TIME mode.

①

The hand position adjustment function is activated, and all the hands
move toward the 12 o’clock position. Then, the second hand turns a
full circle to indicate that it is ready for hand position adjustment.
If any of the three hands do not point to the 12 o’clock position
exactly, follow the procedure below to set it to the 12 o’clock position.

While Button Ⓐ is kept pressed to activate the hand position

※

adjustment function, the minute hand setting display of the
manual time setting function appears temporarily. Be sure to
keep the button pressed for more than 10 second until all the
hands move toward the 12 o’clock position. (Refer to “How to
Adjust Time Manually” on P. 14.)

Press Button Ⓑ to set the second hand to the 12 o’clock position.

②

③

The second hand moves quickly if Button Ⓑ is kept pressed.

※

After the second hand position adjustment is completed, press Button Ⓐ.

Press and hold

Button

Ⓐ

Button Ⓐor returns automatically in 3 minutes

Button

18

Ⓐ

Button



The minute hand moves to indicate that it is ready for hand
position adjustment.

Press Button Ⓑ to set the minute hand to the 12 o’clock position.

④

The minute hand moves quickly if Button Ⓑ is kept pressed.

※

After the minute hand position adjustment is completed, press Button Ⓐ.

⑤

The hour hand moves to indicate that it is ready for hand position adjustment.

Press Button Ⓑ to set the hour hand to the 12 o’clock position.

⑥

The hour hand moves quickly if Button Ⓑ is kept pressed.

※

After the hour hand position adjustment is completed, press Button

⑦

.

The hand position adjustment function is deactivated, and

Ⓐ

the display returns to the time.
3 minutes, or if the rotating bezel is turned to change the mode to
another, the hand position adjustment function is also deactivated,
and the hand position you have set is registered.

Ⓐ

If the watch is left untouched for

7. TO PRESERVE THE QUALITY OF YOUR WATCH

Daily Care

The watch requires good daily care.

●

Wipe away moisture, sweat or dirt with a soft cloth.

・

After soaking the watch in seawater, be sure to wash the watch in

・

clean pure water and wipe it dry carefully.

If your watch is rated as "Non-water resistant" or "water resistant

　 ※

for everyday life," do not wash the watch. Do not pour running
water directly from faucet onto the watch. Put some water into a
bowl rst, and them soak the watch in the water to wash it.

"Performance and Type" on P. 19

→

"Water Resistance" on P. 20

→

Performance and Type

The case back shows the caliber No. and performance of
your watch.

Water resistant

performance

Refer to P. 2 0 .

N855-00A0

Caliber No.

The number to

identify the type of

your watch

19

※The case back design differs from model to model, and the

case back illustrated above may not be the same as that of
your watch.

7. TO PRESERVE THE QUALITY OF YOUR WATCH

Water Resistance

Refer to the table below for the water resistant
performance of your watch before use.

(Refer to P. 19 .)

Indication on the Case Back

No indication Non-water resistance

WATER RESISTANT Water resistance for everyday life

WATER RESISTANT

5 BAR

WATER RESISTANT

10 (20) BAR

Water resistance for everyday life at
5 barometric pressures

Water resistance for everyday life at
10 (20) barometric pressures

Water Resistant Performance

Condition of Use

Avoid drops of water or sweat

The watch withstands accidental
contact with water in everyday life.

The watch is suitable for sports such as swimming.

The watch is suitable for diving not using an air cylinder.

WARNING

Not suitable for swimming

20

7. TO PRESERVE THE QUALITY OF YOUR WATCH

Band

The band touches the skin directly and becomes dirty with sweat
or dust. Therefore, lack of care may accelerate deterioration of
the band or cause skin irritation or stain on the sleeve edge. The
watch requires a lot of attention for longer use.

Metallic band

●

・ Moisture, sweat or soil will cause rust even on a stainless steel band

if they are left for a long time.

・ Lack of care may cause a yellowish or gold stain on the lower sleeve

edge of shirts.

・

Wipe off moisture, sweat or soil with a soft cloth as soon as possible.

・ To clean the soil around the joint gaps of the band, wipe it out in

water and then brush it off with a soft toothbrush.

（Protect the watch body from water splashes by wrapping it up in

plastic wrap etc.

・

Because some titan bracelets use pins made of stainless steel, which
has outstanding strength, rust may form in the stainless steel parts.

・ If rust advances, pins may poke out or drop out, and the watch case

may fall off the bracelet, or the clasp may not open.

・ If a pin is poking out, personal injury may result. In such a case,

refrain from using the watch and request repair.

Leather band

●

・ A leather band is susceptible to discoloration and deterioration from

moisture, sweat and direct sunlight.

・ Wipe off moisture and sweat as soon as possible by gently blotting

them up with a dry cloth.
・ Do not expose the watch to direct sunlight for a long time.
・ Please take care when wearing a watch with light-colored band, as

dirt is likely to show up.
・ Refrain from wearing a leather band watch other than Aqua Free

bands while bathing, swimming, and when working with water even

if the watch itself is water-resistant enforced for daily use （10- or 20-

BAR water resistant）.

）

Silicone band

●

・ As for material characteristics, the band is easily dirtied, and may

be stained and discolored. Wipe off dirt with a wet cloth or cleaning
tissue.

・ Unlike bands of other materials, cracks may result in the band being

cut. Take care not to damage the band with an edged tool.

Polyurethane band

●

・ A polyurethane band is susceptible to discoloration from light, and

may be deteriorated by solvent or atmospheric humidity.

・ Especially a translucent, white, or pale colored band easily adsorbs

other colors, resulting in color smears or discoloration.
・ Wash out dirt in water and clean it off with a dry cloth.
（Protect the watch body from water splashes by wrapping it up in

plastic wrap etc.

・ When the band becomes less exible, have the band replaced with

a new one. If you continue to use the band as it is, the band may

develop cracks or become brittle over time.

Notes on skin
irritation and
allergy

Notes on the
length of the
band

）

Skin irritation caused by a band has various
reasons such as allergy to metals or leathers, or
skin reactions against friction on dust or the band
itself.

Adjust the band to allow a little
clearance with your wrist to ensure
proper airflow. When wearing the
watch, leave enough room to insert
a nger between the band and your
wrist.

21

7. TO PRESERVE THE QUALITY OF YOUR WATCH

Remarks on Battery

1. Notes on the battery

(1) Battery life

This watch keeps operating for approximately 7 years if a new normal

battery is inserted in it.

※ If the time synchronization via the Bluetooth communication is used

more than once a day and/or the count-up timer more than 1 hour a
day, however, the watch may run down in less than 7 years.

(2) Monitor battery

The battery in your watch is a monitor battery which is inserted at the
factory to check the function and performance of the watch. Its actual
life once in your possession may be less than the specied period.

(3) Battery replacement

・For battery replacement, be sure to have the battery replaced with

a new one at the retailer from whom the watch was purchased,
specifying a genuine SEIKO battery.

・If the old battery is left in the watch for a long time, a malfunction

may be caused due to battery leakage, etc. Have it replaced with a
new one as soon as possible.

・Battery replacement is made at cost even if it runs down within the

guarantee period.

・Once the case back is opened for battery replacement or other

purposes, the original water resistant quality designed for the
watch may deteriorate when it is closed. When you have the battery
replaced with a new one, also request the water resistance test
suitable for the water resistant quality of your watch. If your watch
has 10-bar or higher water resistant quality, be sure to have such
test performed on the watch every time the battery is replaced.
Please note that it takes several days to check the water resistant
quality of your watch. When requesting the checking, therefore,
please confirm the period required for it.

・If the watch stops operating soon after the battery is replaced with

a new one, it needs to be overhauled. (Refer to P. 2 3.)

2. Battery life indicator

The watch is equipped with a battery life indicator that enables you to
know when the battery needs to be replaced.

When the second hand starts moving at 2-second intervals, the

※

watch may run down in a week or so. Have the battery replaced with
a new one as soon as possible by the retailer from whom the watch
was purchased.

Do not open the case back to take out the

●

battery.
If the battery is removed from the case back

●

WARNING

CAUTION

for any unavoidable reason, put it in a place
beyond the reach of children. If it is swallowed
by a child, consult the doctor immediately.

Never short-circuit, heat or disassemble the

●

battery. Never put it close to a fire. It may
explode, generate an intense heat or catch re.

The battery inserted in your watch is not

●

rechargeable. Never attempt to recharge it. If it
is recharged accidentally, it may explode.

Use only the battery specied for your watch. If

●

a battery other than specied is inserted in the
watch, it may explode.

When disposing of an old battery, observe the

●

regulations of the local authorities concerned.

22

7. TO PRESERVE THE QUALITY OF YOUR WATCH

After-Sales Service

Notes on guarantee and repair

●

Contact the retailer from whom the watch was purchased or SEIKO

・

CUSTOMER SERVICE CENTER for repair or overhaul.

Within the guarantee period, present the certicate of guarantee to

・

receive repair services.

Guarantee coverage is provided in the certificate of guarantee.

・

Read carefully and retain it.

For repair services after the guarantee period has expired, if the

・

functions of the watch can be restored by repair work, we will
undertake repair services upon request and payment.

Replacement parts

●

SEIKO makes it a policy to typically keep a stock of replacement

・

parts for this watch for 7 years. Replacement parts are those which
are essential to maintaining the functional integrity of the watch.

Please note that if original parts are not available, they may be

・

replaced with substitutes whose external appearance may differ
from the originals.

Disassembly and cleaning (overhaul) for checking and

●

adjustment purpose

It is recommended that disassembly and cleaning (overhaul)
for checking and adjustment purpose be performed
periodically approximately once every 3 to 4 years, in order
to maintain optimal performance of the watch for a long time.

The watch is a precision device. It may stop operating or lose time

・

if its parts run low on oil or wear out.

The watch may also stop operating due to battery leakage

・

depending on the condition of use.
Its water resistant quality may be impaired due to entry of

・

perspiration or moisture as the gasket or other parts deteriorate.

If any of the above should occur, please contact the retailer from
whom the watch was purchased for disassembly and cleaning
(overhaul) for checking and adjustment purpose. For replacement
of parts, please specify "SEIKO GENUINE PARTS." When requesting
overhaul, be sure to have the gasket and push pin replaced with new
ones.

Please note that the movement of your watch may be replaced

※

with a new one when it is overhauled.



23

8. TROUBLESHOOTING

Troubleshooting (1)

Problem Possible Cause Solution Refer to

The watch has stopped operating. The battery has run down. Immediately request the retailer from

The second hand moves at 2-second intervals.

Bluetooth communication will not start when
manual reception is performed.
(The second hand points to "N.")

Bluetooth communication cannot be
performed.

The battery nears its end.

The application is not running. Start up the application.

The watch is not registered to the
application.

The airplane mode of the smartphone
is turned on.

The Bluetooth function of the smartphone
is turned off.

The location function of the smartphone
is turned off (for Android smartphone
only).

whom the watch was purchased to
replace the battery with a new one.

If your smartphone runs on iOS, it is
necessary to start up the application
each time the smartphone is rebooted.

Register the watch to the application.

Turn off the airplane mode of the
smartphone, and then, start up the
application. For such operation, refer to the
instruction manual, etc. of the smartphone.

Turn on the Bluetooth function of the
smartphone. For such operation, refer to the
instruction manual, etc. of the smartphone.

Turn on the location function of the
smartphone. For such operation, refer to the
instruction manual, etc. of the smartphone.

P. 3 of Application
Operating Guide

P. 5 of Application
Operating Guide

P. 3 of Application
Operating Guide

P. 4 of Application
Operating Guide

The application is not allowed to access
the location information (for Android
smartphone only).

The watch is used with a new smartphone.

24

Configure the smartphone so that the
application is allowed to access the
location information.

The watch may attempt to
communicate with the old smartphone.
Uninstall the application on the old
smartphone, or delete the watch
registered to it.

P. 4 of Application
Operating Guide

P. 7 of Application
Operating Guide

8. TROUBLESHOOTING

Troubleshooting (2)

Problem Possible Cause Solution Refer to

Bluetooth communication cannot be
performed.

The automatic reception function will
not work.

A battery saving application is affecting
the operation of the application
dedicated for the watch.

The smartphone and the watch are
placed wide apart from each other.

There is some object between the
smartphone and the watch that interferes
with the Bluetooth communication.

Radio wave interference affecting the
Bluetooth communication has occurred
around the place of use.

The automatic reception function of the
watch is turned off.

Congure applications for saving battery
consumption or improving battery life
to exclude the dedicated application. For
such operation, refer to the instruction
manual, etc. of those applications.

The automatic reception is performed at
a time of day when the previous manual
reception was performed. Place the
smartphone and the watch within 3 m
from each other during that time period.

Place the smartphone and the watch at
a place where there is no obstruction
between them. While in use, do not put
any of them in a metal case or the like.

Perform the Bluetooth communication
at a place sufficiently away from
devices emitting radio wave, such
as electric machine emitting strong
electromagnetic field and information
household appliances having
communication function.

Turn the rotating bezel to align the
mode indicator with "CONNECT."

P. 12 of this
Instruction Manual

Any of the hands will not point to its
proper position.
Ex.)・The second hand does not

exactly point to the reception
result position, "Y" or "N."

The hands do not indicate

・

month and date properly.

The hands have become misaligned
from the original position due to strong
magnetism, shock or other external
cause.

25

Use the hand position adjustment mode
to check if the hand position needs to
be adjusted. If any of the hands do not
point to the 12 o'clock position exactly,
adjust its hand position.

P. 18 of this
Instruction
Manual

8. TROUBLESHOOTING

Troubleshooting (3)

Problem Possible Cause Solution Refer to

The watch does not indicate the local
time properly during travel abroad,
irrespective of whether the time
synchronization is performed via
manual or automatic reception method.

Blur on the watch glass persists.

The rotating bezel does not turn
smoothly.

The smartphone is not configured to
indicate the local time properly.

Water has entered inside the watch due
to a deteriorated gasket or for any other
reason.

Sand or dirt enters the clearance
between the rotating bezel and the
watch case.

Check the time indicated by the

・

smartphone.

Congure the smartphone to indicate

・

the proper local time.

For the operation and configuration

・

of the smartphone, refer to the
instruction manual of the smartphone.

Consult the retailer from whom the watch
was purchased.

If sand or dirt enters the clearance
between the rotating bezel and the
watch case, the rotating bezel may not
turn smoothly. If the watch is soiled
with such foreign matter, rinse it off
completely in a container of tap water.
If the problem persists after rinsing,
consult the retailer from whom the
watch was purchased.

26

8. TROUBLESHOOTING

How to Reset Built-In IC (System Reset)

If the watch should function improperly, follow the procedure below to reset the built-in IC (system reset). It will return to normal. After the system

●

reset is performed, the time/calendar returns to its default setting. Be sure to set the time/calendar properly before use.

[ System reset completed ]

Button

[ Any mode ]

Ex.) TIME mode

Ⓐ

Press and hold both

Button Ⓐand Button

at the same time for more

Second hand position adjustment in

hand position adjustment function

Button

than 10 seconds

Ⓑ

Ⓑ

[ Hand position adjustment ]

After adjusting the hand
position following the
procedure in "How to
Adjust Hand Position" on

P. 1 8 , return the display

to the time.

If Bluetooth
communication
is available

If Bluetooth
communication
is not available

Follow the procedure
in “Manual Reception”
on P. 1 2 to set the time/
calendar properly.

Follow the procedure
in “How to Adjust Time
Manually” on P. 1 4 and
“How to Adjust Calendar
Manually” on P. 1 6 to
manually set the time/
calendar properly.

■

※After the system reset procedure, the watch will not return to

Operation Method

Press and hold both Buttons Ⓐ and Ⓑat the same time for

①

more than 10 seconds in any mode, TIM E, CONNECT or COUNT­UP. The built-in IC is reset (system reset), and the hand position
adjustment function is activated. Then, the second hand turns a
full circle to indicate that it is ready for hand position adjustment.

Follow the procedure in "How to Adjust Hand Position" on P. 1 8

②

to set the hands that are misaligned from the 12 o'clock position
exactly in position.

After the hand position adjustment of all the hands is completed,

③

press Button Ⓐto return to the time display.

the time display automatically in 3 minutes. The time display
will not appear by turning the rotating bezel to change the
mode to TIME or CONNECT.

27

  ※

④

⑤

When the time display resumes, the watch starts indicating the
time from the default setting below:

Time : AM12：00：00

Calendar : January 1st, with the number of years

elapsed from leap year "0"

If you have your smartphone at hand, and the time synchronization

with the dedicated application via Bluetooth communication is
available, perform the manual reception to set the time/calendar
properly. (Refer to "Manual Reception" on P. 1 2 .)

If you cannot use your smartphone, and
with the dedicated application via Bluetooth communication is

not available, manually set the time/calendar properly on the
watch alone. (Refer to "How to Adjust Time Manually" on P. 1 4
and "How to Adjust Calendar Manually" on P. 1 6 .)

the time synchronization

9. SPECIFICATIONS

Specifications

1. Basic functions

Basic watch function (hour, minute and second hands)

・

Perpetual calendar (month and date display)

・

Timer function (count-up timer)

・

Time synchronization function via Bluetooth communication (automatic/manual reception, and reception result display)

・

2. Frequency of crystal oscillator ....... 32,768 Hz (Hz = Hertz ... Cycles per second)

3. Loss/gain (monthly rate) ................. Less than 15 seconds (when the watch is worn on the wrist at normal temperature range between 5℃ and 35℃)

4. Operational temperature range .....－5

5. Driving system ................................ Step motor, 3 pieces

6. Battery .............................................. Lithium battery, SB-T11 (CR2016), 1 piece

7. Battery life ........................................ Approximately 7 years (on condition that the count-up timer is used less than 1 hour per day and/or the time

8. IC (Integrated Circuit) ...................... Oscillator, frequency divider, driving and reception circuit: C-MOS-IC, 2 piece

※The specications above are subject to change without prior notice for product improvements.

℃～＋50℃

synchronization via Bluetooth communication less than once per day)

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