Casio 2471 User Manual
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USER’S GUIDE 2471

Getting Acquainted

Congratulations upon your selection of this CASIO watch. To get the most out of your purchase, be sure to carefully read this manual and keep it on hand for later reference when necessary.

Expose the watch to bright light to charge its battery before using it.

You can use this watch even as its battery is being charged by exposure to bright light.

Be sure to read “Battery” of this manual for important information you need to know when exposing the watch to bright light.

Applications

The built-insensors of this watch measure direction, altitude, barometric pressure, and temperature. Measured values are then shown on the display. Such features make this watch useful when hiking, mountain climbing, or when engaging in other such outdoor activities.

Warning!

The measurement functions built into this watch are not intended for taking measurements that require professional or industrial precision. Values produced by this watch should be considered as reasonable representations only.

When engaging in mountain climbing or other activities in which losing your way can create a dangerous or life-threateningsituation, always be sure to use a second compass to confirm direction readings.

CASIO COMPUTER CO., LTD. assumes no responsibility for any loss, or any claims by third parties that may arise through the use of this watch.

General Guide

The illustration below shows which buttons you need to press to navigate between modes.

If the display of the watch is blank...

If the SLEEP indicator is on the display (either flashing or steady), it means that the display is blank because the watch's Power Saving function has shut it to conserve power. Power Saving automatically turns off the display and puts the watch into a sleep state whenever your watch is left in an area where it is dark for a certain period.

The initial factory default setting is Power Saving on.

The watch recovers from the sleep state if you move it to a well-litarea*, if you press any button, or if you angle the watch towards your face for reading.

*It can take up to five seconds for the display to turn on.

See “Power Saving Function” for more information.

About This Manual

Button operations are indicated using the letters shown in the illustration.

Each section of this manual provides you with the information you need to perform operations in each mode. Further details and technical information can be found in the “Reference” section.

(Light)

You can use buttons B, C, and E to directly enter a sensor mode from the Timekeeping Mode or from another sensor mode. To get to a sensor mode from the Data Recall or Alarm Mode, you must go to the Timekeeping Mode first.

Data Recall Mode

 

 

D

 

Alarm Mode

 

 

 

 

Sensor Modes

 

 

 

Timekeeping Mode

 

Press C.

 

Press E.

 

 

Press B.

 

 

Press D.

 

 

 

 

 

 

 

 

Digital Compass Mode

Barometer/

Altimeter Mode

 

Thermometer Mode

 

 

 

 

 

 

 

D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Press D.

 

Timekeeping

PM indicator

Seconds

 

 

Day of week

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Month – Day

Hour : Minutes

Use the Timekeeping Mode to set and view the current time and date.

To set the time and date

1.In the Timekeeping Mode, hold down A until the seconds start to flash, which indicates the setting screen.

2.Press D to move the flashing in the sequence shown below to select other settings.

 

 

Seconds

 

 

 

 

Hour

 

 

 

 

 

Minutes

 

 

12/24-Hour

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Format

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Saving

 

 

 

Day of

 

 

 

 

 

Day

 

 

Month

 

 

 

Year

 

 

 

on/off

 

 

 

week

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.When the setting you want to change is flashing, use E to change it as described below.

Setting

Screen

Button Operations

Seconds

 

Press E to reset the seconds to 00.

Hour, Minutes

 

Use E (+) to change the setting.

12/24-Hour

 

Use E to toggle between 12-hour(12H) and

format

 

24-hour(24H) timekeeping.

Year, Month,

 

Use E (+) to change the setting.

Day

 

 

Day of week

 

Use E (+) to change the setting.

Power Saving

 

Press E to toggle the Power Saving on

on/off

 

(On) and off (OFF).

 

 

 

4. Press A to exit the setting screen.

Digital Compass

A built-inbearing sensor detects magnetic north and indicates one of 16 directions on the display. Direction readings are performed in the Digital Compass Mode.

You can calibrate the bearing sensor if you suspect the direction reading is incorrect.

To enter and exit the Digital Compass Mode

1.While in the Timekeeping, Barometer/Thermometer, or Altimeter Mode, press B to enter the Digital Compass Mode.

At this time, the watch immediately starts a Digital Compass operation. After about two seconds, letters appear on the display to indicate the direction that the 12 o’clock position of the watch is pointing.

2.Press D to return to the Timekeeping Mode.

To take a direction reading

Magnetic north pointer

12 o’clock position

Direction

Timekeeping Mode time

Direction value (in degrees)

W

 

NW

NNW

0°

NW

 

 

 

 

 

W

 

 

 

N

 

 

WSW

 

 

 

N

 

 

 

 

N

 

 

 

 

E

SW

 

 

 

 

 

NE

W

 

 

 

E

N

E

S

 

 

 

 

S

 

 

 

 

 

S

 

 

 

E

 

 

ES

 

 

E

 

 

 

S

SE

ES

 

 

 

1.Enter the Digital Compass Mode.

2.Place the watch on a flat surface or (if you are wearing the watch), make sure that your wrist is horizontal (in relation to the horizon).

3.Point the 12 o’clock position of the watch in the direction you want to measure.

4.Press B to start a Digital Compass measurement operation.

After about two seconds, the direction that the 12 o’clock position of the watch is pointing appears on the display.

Also, four pointers appear to indicate magnetic north, south, east, and west.

After the first reading is obtained, the watch continues to take direction readings automatically each second, for up to 20 seconds.

1

Not visible on the display.

USER’S GUIDE 2471

The COMP indicator flashes on the display while a measurement is in progress.

The direction value that appears on the display represents the clockwise angle formed between magnetic north (which is 0 degrees) and the displayed direction.

Note

Note that taking a measurement while the watch is not horizontal (in relation to the horizon) can result in large measurement error.

The margin of error for the direction value is ±11 degrees. If the indicated direction is northwest (NW) and 315 degrees, for example, the actual direction can be anywhere from 304 to 326 degrees.

Digital Compass operation is automatically interrupted whenever an alarm (Daily Alarm or Hourly Time Signal) sounds. If this happens, start the Digital Compass operation again from the beginning.

The following table shows the meanings of each of the direction abbreviations that appear on the display.

Direction

Meaning

Direction

Meaning

Direction

Meaning

Direction

Meaning

N

North

NNE

North-

NE

Northeast

ENE

East-

northeast

northeast

 

 

 

 

 

 

E

East

ESE

East-

SE

Southeast

SSE

South-

southeast

southeast

 

 

 

 

 

 

S

South

SSW

South-

SW

Southwest

WSW

West-

southwest

southwest

 

 

 

 

 

 

W

West

WNW

West-

NW

Northwest

NNW

North-

northwest

northwest

 

 

 

 

 

 

See “Digital Compass Precautions” for other important information about taking direction readings.

Barometer/Thermometer

This watch uses a pressure sensor to measure air pressure (barometric pressure) and a temperature sensor to measure temperature.

You can calibrate the temperature sensor and the pressure sensor if you suspect that readings are incorrect.

To take Barometric Pressure and Temperature Readings

Barometric pressure graph (unit: 1hPa (mb)/0.05 inHg)

Temperature

Barometric pressure

Pressing C in the Timekeeping Mode or in any of the other sensor modes enters the Barometer/ Thermometer Mode. The watch automatically starts barometric pressure and temperature measurement, and displays the results.

Barometric pressure is displayed in units of 1hPa/mb (or 0.05 inHg).

Temperature is displayed in units of 0.1°C (or 0.2°F).

The displayed barometric pressure value changes toxxxx hPa/mb (or inHg) if a measured barometric pressure falls outside the range of 260 hPa/ mb to 1100 hPa/mb (7.65 inHg to 32.45 inHg). The barometric pressure value will be displayed again as soon as the measured barometric pressure is within the allowable range.

The displayed temperature value changes to xx.x °C (or°F) if a measured temperature falls outside the range of–10.0°Cto 60.0°C (14.0°F to 140.0°F). The temperature value will be displayed again as soon as the measured temperature is within the allowable range.

Some countries refer to the barometric pressure unit hecto-pascal(hPa) as millibars (mb). It really makes no difference, because 1hPa = 1mb. In this manual, we use hPa/mb or hPa (mb).

See “About Barometric and Temperature Measurements” for important precautions.

Barometric Pressure Graph

Barometric pressure indicates changes in the atmosphere. By monitoring these changes you can predict the weather with reasonable accuracy. The barometric pressure graph shows the barometric readings for the past 26 hours. The flashing point on the right of the display is the point for the newest measurement. Note that pressure graph readings are relative to the newest measurement point. One dot above the newest point is plus 1hPa(mb)/

0.05 inHg, while one dot below is minus 1hPa(mb)/0.05 inHg. The following shows how to interpret the data that appears on the barometric pressure graph.

A rising graph generally means improving weather.

A falling graph generally means deteriorating weather.

Note that if there are sudden changes in weather or temperature, the graph line of past measurements may run off the top or bottom of the display. The entire graph will become visible once barometric conditions stabilize.

The following conditions cause the barometric pressure measurement to be skipped, with the corresponding point on the barometric pressure graph being left blank.

Barometric reading that is out of range (260 hPa/mb to 1,100 hPa/mb or 7.65 inHg to 32.45 inHg)

Sensor malfunction

Dead batteries

About Barometric and Temperature Measurements

Barometric pressure and temperature measurement operations are performed as soon as you enter the Barometer/Thermometer Mode. After that, barometric pressure and temperature measurements are taken every five seconds for the first three minutes.

The BARO indicator flashes on the display while a measurement is in progress.

The barometer automatically takes measurements every two hours (starting from midnight), regardless of what mode you are in. The results of these measurements are used for the barometric pressure graph.

You can also perform a barometric pressure and temperature measurement at any time by pressing C in the Barometer/Thermometer Mode.

Barometer and Thermometer Precautions

The pressure sensor built into this watch measures changes in air pressure, which you can then apply to your own weather predictions. It is not intended for use as a precision instrument in official weather prediction or reporting applications.

Sudden temperature changes can affect pressure sensor readings.

Temperature measurements are affected by your body temperature (while you are wearing the watch), direct sunlight, and moisture. To achieve a more accurate temperature measurement, remove the watch from your wrist, place it in a well ventilated location out of direct sunlight, and wipe off all moisture from the case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual surrounding temperature.

You can change the measured barometric pressure unit between hectopascals/millibars (hPa/mb) and inchesHg (inHg). See “Changing the Barometric Pressure and Temperature Units” for details.

You can change the measured temperature value displayed by this watch between Celsius (°C) and Fahrenheit (°F). See “Changing the Barometric Pressure and Temperature Units”.

Altimeter

A built-inaltimeter uses a pressure sensor to detect the current air pressure, which is then used to estimate the current altitude. The watch is preprogrammed with ISA (International Standard Atmosphere) preset values, which are used to convert air pressure readings to altitude values. If you preset a reference altitude, the watch will also calculate the current relative altitude based on your preset value. Altimeter functions also include data storage memory and an altitude alarm.

Important!

This watch estimates altitude based on air pressure. This means that altitude readings for the same location may vary if air pressure changes.

This watch employs a semiconductor pressure sensor, which is affected by temperature changes. When taking altitude measurements, be sure to do so while ensuring that the watch is not exposed to temperature changes.

To avoid the effect of sudden temperature changes on measurement, wear the watch so it is in direct contact with your wrist during measurement.

Do not rely upon this watch for altitude measurements or perform button operations while engaging in sports where there are sudden altitude changes, while sky diving, hang gliding, or paragliding, or while riding a gyrocopter, glider, or any other aircraft.

Do not use this watch for measuring altitude in applications that demand professional or industrial level precision.

Remember that the air inside of a commercial aircraft is pressurized. Because of this, the readings produced by this watch will not match the altitude readings announced or indicated the flight crew.

How the Altimeter Works

With the Preset Values (No Reference Altitude)

The watch measures the air pressure at your current location and uses the built-inISA values to convert it to the equivalent altitude.

2

USER’S GUIDE 2471

With a Reference Altitude

If you set a reference altitude, the watch uses that value when calculating altitude based on air pressure.

To determine the height of a tall building, set the reference altitude to 0 on the ground floor. Note, however, that you may not be able to get a good reading if the building is pressurized or air-conditioned.

When mountain climbing, you can set the reference value in accordance with a marker along the way or altitude information from a map. After you do this, the altitude readings produced by the watch will be more accurate than they would without a reference altitude.

To take an altitude reading

B

A

400

Pressing E in the Timekeeping Mode or in any of the other sensor modes enters the Altimeter Mode. The watch automatically starts altitude measurement, and displays the results.

Altitude graph (current altitude flashing) (unit: 10m/40 ft.)

Altitude

About one second later

Timekeeping Mode time

See “About Altitude Measurements” for important information.

Altitude is displayed in units of 5 meters (20 feet).

The measurement range for altitude is –700to 10,000 meters(–2,300to 32,800 feet).

The measured altitude may be a negative value in cases where there is a reference altitude value set or because of certain atmospheric conditions.

The displayed altitude value changes to xxxxx meters (or feet) if a measured altitude falls outside the measurement range. The altitude value will be displayed again as soon as the measured altitude is within the allowable range.

You can change the unit of measurement for the displayed altitude values between meters (m) and feet (ft). See “To change the Altitude Units”.

About Altitude Measurements

There are two types of altitude measurements: those for displayed data (Altimeter Mode measurements) and those for memory data (Memory measurements).

Altimeter Mode measurement

You can perform Altimeter Mode measurements in the Altimeter Mode only, and an altimeter measurement operation starts whenever you enter the Altimeter Mode.

During the first three minutes after entering the Altimeter Mode, ALTI flashes on the display and measurements are taken every five seconds. After that, the interval between measurements depends on whether you are using the Short Mode(1-minuteintervals) or the Long Mode(2-minuteintervals).

Long Mode is the default setting. See “Memory measurement” for information about the Short Mode and Long Mode.

If you do not perform any operation while in the Altimeter Mode, the watch automatically returns to the Timekeeping Mode after four or five hours in the Short Mode, or after nine or 10 hours in the Long Mode.

Memory measurement

The memory measurement operation stores the following data in watch memory. Note that each time you perform a memory measurement operation, it creates a new set of records, replacing the set of records currently in memory. Memory measurement continues to be performed (indicated by the REC indicator flashing on the display) even if you change to another mode.

Measurement start time, date, and altitude: 1 record

Automatic altitude readings and time, at fixed interval: Up to 39 records Measurement end time, date, and altitude: 1 record

The watch also calculates the following values using measured data and maintains one record for each in memory.

Relative altitude (altitude difference between start point and current altitude or measurement end altitude)

Measurement time

Maximum altitude (highest measured altitude in memory) Total ascent (total of ascents (A +B))

Cumulative total ascent (total of all measured altitude values in memory)

Maximum altitude

Stop point

 

B

Start point

 

A

C

Starting a new measurement automatically clears relative altitude, measurement time, maximum altitude, and total ascent values currently in memory.

Starting a new measurement does not clear cumulative total ascent. This value continues to increase until it reaches 99,995 meters (327,983 feet). After that, it reverts to 0 and starts again.

The interval between memory measurements depends on whether the Short Mode or the Long Mode is selected.

Short Mode: 5-minuteinterval Long Mode:15-minuteinterval

Relative altitude, cumulative total ascent, and maximum altitude data is calculated at regular intervals, depending on the Long Mode/Short Mode setting. In both modes, calculations are performed every five seconds for the first three minutes. After that, calculations are performed every minute in the Short Mode and every two minutes in the Long Mode.

To select the Short Mode or Long Mode

 

 

 

 

 

 

 

 

 

 

1. In the Altimeter Mode, hold down A until the

ll ll l

ll

 

 

 

 

display clears. After four or five seconds,

 

 

 

 

either OFF or the current reference altitude

l

 

 

 

 

l

 

 

 

l

 

 

 

 

l

 

 

 

value (if set) starts to flash, which indicates

l

 

 

 

 

 

 

 

l

 

 

 

l

l

 

 

 

l

l l l l

 

 

 

 

 

 

l

 

 

 

 

 

the setting screen.

 

 

 

 

 

 

 

 

 

 

OFF indicates no reference altitude.

 

 

 

 

 

 

 

 

 

 

Note that you will not be able to change the

 

 

 

 

 

 

 

 

 

 

Short/Long Mode setting if a memory

 

 

 

 

 

 

 

 

 

 

measurement operation is in progress.

l l l l

 

 

 

 

 

 

 

2. Press Dtwice.

l

l

 

 

 

 

This causes either0:05 (Short Mode) or

l

 

 

 

 

l

 

 

 

0:15 (Long Mode) to appear, which

ll

 

 

 

 

 

l

 

 

l

 

 

 

 

 

l

 

 

indicates the current mode setting.

 

 

 

 

l

 

 

 

l

l l l l l

l

 

 

 

 

3. Each press of E toggles between the Short

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode and Long Mode.

 

 

 

 

 

 

 

 

 

 

4. Press A to exit the setting screen.

To perform memory measurement

 

 

 

 

 

 

 

 

 

 

Hold down E for about one second until REC

 

 

 

 

 

 

 

 

 

 

flashes, which indicates that memory

 

 

 

 

 

 

 

 

 

 

measurement has started.

 

 

 

 

 

 

 

 

 

 

Memory measurement stops automatically

 

 

 

l l ll

 

after there are 41 records accumulated in

 

 

 

 

memory. When you want to stop a memory

 

 

 

l

 

 

 

 

l

 

 

l

 

 

 

 

l

measurement operation manually, hold down

 

 

l

 

 

 

 

 

 

 

 

l

 

 

 

 

l

 

 

 

l

 

 

l

l

 

 

 

 

 

l

 

 

E for about one second until REC disappears.

 

 

 

 

 

 

 

 

 

 

 

 

 

l l

 

 

While a memory measurement operation is in progress, press A to toggle between the Standard Altitude screen and the Relative Altitude screen.

 

Standard Altitude

Relative Altitude

 

Screen

Screen

 

 

Relative altitude

Altitude

 

Press A.

 

 

Timekeeping Mode time

REL indicator Measurement time

Note

REC flashes on the display while a memory measurement operation is in progress.

Starting the memory measurement operation deletes any altimeter data (except for cumulative total ascent data) currently in memory (and its graph) and replaces it with the new data. Note that you cannot delete memory contents manually.

You can recall data in memory using the Data Recall Mode.

Setting a Reference Altitude

After you set a reference altitude, the watch adjusts its air-pressure-to-altitudeconversion calculation accordingly. The altitude measurements produced by this watch are subject to error caused by changes in air pressure. Because of this, we recommend that you update the reference altitude whenever one is available during your climb.

To set a reference altitude

 

 

1.

In the Altimeter Mode, hold down A until the

 

 

 

display clears. After four or five seconds,

ll ll l ll

 

either OFF or the current reference altitude

l

l

 

value (if set) starts to flash, which indicates

l

l

 

l

 

the setting screen.

l

ll

 

l l l l l l

2.

Press E (+) or B (–)to change the current

 

 

reference altitude value by 5 meters (or 20 feet).

You can set the reference altitude within the range of–10,000to 10,000 meters(–32,800to 32,800 feet).

3

USER’S GUIDE 2471

Pressing E and B at the same time returns to OFF(no reference altitude), so the watch performs air pressure to altitude conversions based on preset data only.

3.Press A to exit the setting screen.

About the Altitude Alarm

The altitude alarm sounds for about five seconds when the current altitude matches a preset value during an altitude measurement operation. You can press any button to stop the alarm after it starts to sound.

The altitude alarm sounds only while the Altimeter Mode’s Altitude Screen is on the display. It does not sound while the watch is in another mode or while another Altimeter Mode screen is on the display.

Example

If you set the altitude alarm at 130 meters, it sounds when you pass the 130meter mark on your way up and on your way back down.

To set the altitude alarm

 

 

 

 

1. In the Altimeter Mode, hold down A until the

 

l ll

display clears. After four or five seconds,

l

either OFF or the current reference altitude

 

l

l

 

l

 

l

 

value (if set) starts to flash, which indicates

l

 

l

l

l

l

 

ll

 

the setting screen.

 

 

 

 

 

 

2. Press D once to move the flashing to the

Altitude alarm value

altitude alarm setting.

Press D to move the flashing in the

 

 

 

 

 

 

 

 

sequence shown below.

Altitude

Long/Short

Altitude

Reference

Alarm

Mode Setting

Unit

Altitude

 

 

 

3. Press E (+) or B (–)to change the current

l

l ll

altitude alarm value by 5 meters (or 20 feet).

You can set the altitude alarm value within

 

l

l

 

l

l

 

 

l

 

l

 

the range of –10,000to 10,000 meters

l

l

 

 

ll

l

 

(–32,800to 32,800 feet).

 

 

 

 

 

 

 

Pressing Eand Bat the same time resets the altitude alarm value toO. 4. Press A to exit the setting screen.

To turn the altitude alarm on and off

Altitude alarm on indicator

Current On/Off status

1.In the Altimeter Mode, hold down A until the display clears. After four or five seconds, either OFF or the current reference altitude value (if set) starts to flash, which indicates the setting screen.

2.Press D once to move the flashing to the altitude alarm setting.

3.Press C to toggle the altitude alarm on (ON) and off (OFF).

4.Press A to exit the setting screen.

An altitude alarm on indicator appears on the Altimeter Mode’s Altitude Screen while the altitude alarm is turned on. This indicator does not appear on any other screen or in any other mode.

Data Recall

Use the Data Recall Mode to view memory measurement data.

To view memory measurement data

1.Enter the Data Recall Mode.

2.Press E to cycle through the various data screens in the sequence

shown below.

To view the cumulative total ascent value, press C.

If an error occurs during memory measurement, the xxxxx is shown for the relative altitude in the Data Recall Mode.

Altitude

Alternates at

1-secondintervals.

Recording date

(Year, Month – Day)

Recording time (Hour : Minutes)

Start Time Data

Measurement

End Time

 

 

 

Data

Data

 

 

Press E.

 

 

 

 

 

 

 

Press

 

 

 

 

C.

 

 

 

 

 

 

 

Cumulative

 

Maximum Altitude

Total Ascent

Relative Altitude

Total Ascent

 

 

 

 

 

 

Measurement Time

Alarm

Hourly time signal on indicator

Alarm on indicator

Timekeeping Mode time

Alarm time (Hour : Minutes)

To set the alarm time

l

llll

 

 

l

l

 

 

l

l

 

l

l

 

l

 

 

l

l

 

 

 

ll l

 

After you set (and turn on) the daily alarm, the alarm tone sounds when the alarm time is reached. You can also turn on an Hourly Time Signal that causes the watch to beep for about one second every hour on the hour.

All of the operations in this section are

performed in the Alarm Mode, which you enter by pressing D.

1.In the Alarm Mode, hold down A until the hour setting of the alarm time starts to flash,

which indicates the setting screen.

This automatically turns on the alarm.

2.Press D to move the flashing between the hour and minute settings.

3.While a setting is flashing, use E to increase it.

When setting the alarm time using the 12-hourformat, take care to set the time correctly as a.m. (no indicator) or p.m. (P indicator).

4.Press A to exit the setting screen.

Alarm Operation

The alarm sounds at the preset time for about 10 seconds (in all modes), or until you stop it by pressing any button.

To test the alarm

In the Alarm Mode, hold down E to sound the alarm.

To turn the daily alarm and the Hourly Time Signal on and off

In the Alarm Mode, press E to cycle through the settings shown below.

Alarm On Indicator / Hourly Time Signal On Indicator

Alarm On

Alarm Off

Alarm On

Alarm Off

Signal On

Signal Off

Signal Off

Signal On

The alarm on indicator and the Hourly Time Signal on indicator are shown on the display in all modes while these functions are turned on.

Backlight

Auto light switch on

The backlight uses an EL (electro-luminescent)

panel that causes the entire display to glow for

indicator

easy reading in the dark. The watch’s auto light

 

 

switch automatically turns on the backlight when

 

you angle the watch towards your face.

 

The auto light switch must be turned on

 

(indicated by the auto light switch on indicator)

 

for it to operate.

 

See “Backlight Precautions” for other important

 

information about using the backlight.

4