Sennheiser CX 400 BT Wit User manual
CX 400BT True Wireless
True wireless stereo earphones
Type: CX400TW1, CX400TW1 R, CX400TW1 L, CX400TW1 C
Instruction manual
Use the search function, the navigation (left) or the following links:
Start
“Product overview”
“Getting started”
“Using the earphones”
“FAQ/If a problem occurs ...”
“Specifications”
Sennheiser electronic GmbH & Co. KG
Am Labor 1
30900 Wedemark
Germany
www.sennheiser.com
Version: 09/20 A01
Important safety instructions
Important safety instructions
▷ Read this instruction manual carefully and completely before
using the product.
▷ Always include this instruction manual when passing the product
on to third parties.
▷ Do not use the product if it is obviously defective or makes loud,
unusual (whistling or beeping) noise.
▷ Only use the product in environments where Bluetooth® wireless
transmission is permitted.
Preventing damage to health and accidents
▷ Protect your hearing from high volume levels. Permanent
hearing damage may occur when headphones are used
at high volume levels for long periods of time. Sennheiser
headphones sound exceptionally good at low and medium volume
levels.
▷ Do not insert the earphones too deep into your ears and never
insert them without ear adapters. Always remove the earphones
slowly and carefully from your ears.
▷ The product generates stronger permanent magnetic
fields that could cause interference with cardiac pace
makers, implanted defibrillators (ICDs) and other
implants. Always maintain a distance of at least 3.94"/10 cm
between the product component containing the magnet (earbuds
and charging case) and the cardiac pacemaker, implanted
defibrillator, or other implant.
▷ Keep the product, accessories and packaging parts out of reach
of children and pets to prevent accidents. Swallowing and chok
ing hazard.
▷ Do not use the product in an environment that requires your spe-
cial attention (e.g. in traffic).
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Preventing damage to the product and malfunctions
▷ Always keep the product dry and do not expose it to extreme tem-
peratures (hairdryer, heater, extended exposure to sunlight, etc.)
to avoid corrosion or deformation. The normal operating tempera
ture is from 0 °C to 40 °C/32 °F to 104 °F.
▷ Use only attachments/accessories/spare parts supplied or rec-
ommended by Sennheiser.
▷ Clean the product only with a soft, dry cloth.
Safety instructions for Lithium rechargeable batteries
WARNING
If abused or misused, the rechargeable batteries may leak.
In extreme cases, they may even present a risk of:
•explosion,
• fire development,
• heat generation,
•smoke or gas development.
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2 | CX 400BT True Wireless
Important safety instructions
Only use rechargeable batteries and chargers
recommended by Sennheiser.
Only charge the product / rechargeable batteries at
ambient temperatures between 10 °C to 40 °C/50 °F to
104 °F.
Do not heat the product / rechargeable batteries above
70 °C/140
°F. Avoid exposure to sunlight and do not
throw the product / rechargeable batteries into fire.
When not using the product / rechargeable batteries for
extended periods of time, charge them regularly (about
every three months).
Switch rechargeable battery-powered products off after
use.
Dispose of defective products with built-in rechargeable
batteries at special collection points or return them to
your specialist dealer.
Notes on data collection and processing and on firmware updates
This product stores individual settings such as the volume, the
sound profiles and the Bluetooth connection data of paired devices.
This data is required for the operation of the product and is not trans
ferred to Sennheiser or companies commissioned by Sennheiser and
is not processed.
Using the “Sennheiser Smart Control” app, you can update the firmware of the product for free via an Internet connection. If the device
on which the app is installed is connected to the Internet, the follow
ing data is automatically transferred to and processed by Sennheiser
servers in order to provide and transfer suitable firmware updates:
hardware identifier, hardware revision number, firmware version of
the product, operating system type (Android, iOS) and version, ver
sion of the app. The data will only be used as specified and will not
be stored permanently.
If you do not want this data to be transferred and processed, do not
connect to the Internet.
Intended use/Liability
These headphones have been designed as an accessory for Bluetooth compliant devices. They are intended for wireless audio communication such as music playback and phone calls via Bluetooth
wireless technology.
It is considered improper use when the product is used for any application not named in the corresponding product documentation.
Sennheiser does not accept liability for damage arising from misuse
or improper use of this product and its attachments/accessories.
Sennheiser is not liable for damages to USB devices that are not consistent with the USB specifications. Sennheiser is not liable for damages resulting from the loss of connection due to flat or overaged
rechargeable batteries or exceeding the Bluetooth transmission
range.
Before putting into operation, please observe the respective country-specific regulations.
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CX 400BT True Wireless | 3
Package contents
Package contents
Earbud R for right ear (CX400TW1 R) and
earbud L for left ear (CX400TW1 L)
Charging case with built-in rechargeable battery for
the earbuds (CX400TW1 C)
USB charging cable with USB-C and
USB-A connector, approx. 0.25 m
Silicone ear adapters (size XS, S, M (pre-mounted to
the earbuds) and L)
Quick guide
Safety guide
Online you can find:
• this detailed instruction manual and additional information
(
www.sennheiser.com/download)
• the Sennheiser Smart Control app for configuring the headphones and for additional functions
(www.sennheiser.com/smartcontrol)
A list of accessories can be found on the CX 400BT True Wireless product page at www.sennheiser.com .
Contact your local Sennheiser partner: www.sennheiser.com >
“Service & Support”.
4 | CX 400BT True Wireless
Product overview
1
2 3
4
5
7
8
6
7
9
Product overview
Charging case
CX400TW1 C
LED
displays the charging process/charge status of the
rechargeable battery of the charging case or of the
earbuds (when inserted into the charging case)
Input for USB-C connector
for charging the rechargeable batteries
LED button
activates the LED display for 5 seconds
Built-in rechargeable battery for charging the earbuds on
the go
Type plate
Charging compartment for the left earbud L
Magnetic holders
Charging compartment for the right earbud R
Charging contacts
CX 400BT True Wireless | 5
Product overview
Earphones
CX400TW1 R and CX400TW1 L
Touch control panel
Changeable silicone ear adapters
Left earbud L (slave earbud, receives signals from the right
earbud)
Status LED
Magnetic holders
Charging contacts
Microphones for phone calls
Right earbud R (master earbud, controls the Bluetooth connection to the smartphone and to the left earbud)
Openings for acoustic optimization
Built-in rechargeable battery
6 | CX 400BT True Wireless
Product overview
1x
Overview of the LED indications of the charging case
When a USB cable is connected, the LED of the charging case permanently displays the charging process:
LED
pulses
yellow
lights up
green
flashes
red
Charging case WITH
earbuds inserted
... earbuds and
charging case are
being charged
... earbuds and
charging case are
fully charged
... a charging error/
battery error has
been detected in at
least one earbud (>
30)
Charging case
WITHOUT earbuds
inserted
... charging case is
being charged
... charging case is
fully charged
... a charging error/
battery error has
been detected in the
charging case (>
30)
If you press the LED button and no USB cable is connected, the LED
of the charging case displays the battery charge status or the
charging process of the earbuds for 5 seconds:
CX 400BT True Wireless | 7
Product overview
LED
lights up
green
pulses
yellow
lights up
yellow
lights up
red
flashes
red
Charging case WITH
earbuds inserted
... earbuds are fully
charged and the
charging case can
still charge at least
one complete cycle
... earbuds are being
charged via the
rechargeable bat
tery of the charging
case
... earbuds are fully
charged, the
charging case
cannot charge
another complete
cycle
... rechargeable batteries of the earbuds
and the charging
case are empty
... a charging error/
battery error has
been detected in at
least one earbud (>
30)
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Charging case
WITHOUT earbuds
inserted
... charging case is
fully charged
–
... charging case is
charged less than 90
%
... rechargeable battery of the charging
case is empty
... a charging error/
battery error has
been detected in the
charging case (>
30)
If the LED does not light up:
• Clean the contacts on the earbuds and in the charging case
(>
29).
• Charge the rechargeable batteries of the earbuds and the
charging case until the LED lights up again (>
14).
Overview of the LED indications of the earbuds
8 | CX 400BT True Wireless
Product overview
3x
3x
LED Meaning; the earbuds...
flashes red-blue
for approx. 1
minute
flashes blue 3x
flashes red 3x
lights up blue
lights up red
flashes red
quickly
flashes red
slowly
flashes redgreen for
approx. 1 minute
... are in Bluetooth pairing mode
... Bluetooth pairing or earbud pairing successful
... Bluetooth pairing or earbud pairing failed
... are connected to a device via
Bluetooth
(master earbud (R) is connected to
the smartphone, slave earbud (L) is
connected to the master earbud (R))
... are not connected to a device via
Bluetooth or the connection has
been lost
(master earbud (R) is not connected
to a smartphone, slave earbud (L) is
not connected to the master earbud
(R))
... rechargeable battery is almost
empty
... system error – the Smart Control
app may display details. Perform a
restart (>
... are in earbud pairing mode (to pair
the right and left earbud)
31)
Notes on voice prompts
The earphones output voice prompts for events (the table gives
some examples). Using the Smart Control app, you can change the
language of the voice prompts, choose between voice prompts and
beep sounds, or deactivate the status messages with a few excep
tions (e.g. rechargeable battery is empty).
Voice prompt Meaning/earbuds...
“Power on” ... are switched on
“Power off” ... switch off
“Connected” ... connected via Bluetooth
“No connection” ... not connected via Bluetooth
“Pairing” ... in Bluetooth pairing mode
“Pairing cancelled” ... Bluetooth pairing cancelled
“Pairing successful” ... Bluetooth pairing successful
“Pairing failed” ... Bluetooth pairing not successful
“Recharge headset” ... Rechargeable battery is almost
empty. Recharge the rechargeable
battery.
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CX 400BT True Wireless | 9
Product overview
Voice prompt Meaning/earbuds...
“Call rejected” ... incoming call rejected
“Call ended” ... call ended
“Volume min” ... volume set to minimum
“Volume max” ... volume set to maximum
10 | CX 400BT True Wireless
Getting started
L
R
USB-A
USB-C
LMSXS
R
L
Getting started
1. Waking up the earbuds and the charging case
and charging the rechargeable batteries
Upon delivery, the rechargeable batteries of the earbuds and the
charging case are in sleep mode and have to be woken up by con
necting them to a power source once.
▷ Insert the earbuds into the charging case.
▷ Connect the USB-C cable to the charging case and to a USB
power source (>
The earbuds and the charging case are woken up and the
rechargeable batteries are being charged. The earbuds are now
ready for use.
Alternatively:
14).
▷ Press and hold the LED button on the charging case for 3 sec-
onds.
The earbuds and the charging case are woken up and can now be
used.
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2. Selecting suitable ear adapters for optimum
fit of the earbuds
The perceived sound quality including bass performance and the
best possible noise cancellation of the earphones depends to a large
extent on the correct fit of the earbuds in the ear.
▷ Test which ear adapter size gives you the best sound quality and
the best wearing comfort.
CX 400BT True Wireless | 11
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