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FAQ/If a problem occurs ...
CX 400BT True Wireless | 31
FAQ/If a problem occurs ...
Current list of frequently asked questions (FAQ)
Visit the CX 400BT True Wireless product page at
There you will find a current list of frequently asked questions (FAQ)
and suggested solutions.
Your question has not been answered or the problem persists?
If a problem occurs that is not listed in the FAQ section or if the prob-
lem cannot be solved with the proposed solutions, please contact
your Sennheiser partner for assistance.
To find a Sennheiser partner in your country, search at
www.sennheiser.com > “Service & Support”.
Leaving the Bluetooth transmission range
Wireless calling and streaming are only possible in the Bluetooth
transmission range of your smartphone. The transmission range
largely depends on environmental conditions such as wall thickness,
wall composition etc. With a free line of sight, the transmission
range of most smartphones and Bluetooth devices is up to 10 meters.
If you, and therefore the earphones, leave the Bluetooth transmission
range of the smartphone, the sound quality deteriorates increasingly
until you hear the voice prompt “No connection” and the connection
breaks down completely. If you immediately re-enter the Bluetooth
transmission range, the connection is automatically re-established
and you hear the voice prompt “Connected”. If this is not the case,
tap the touch control panel of the earbud 1x.
The right earbud (master earbud) can be used alone. The left earbud
(slave earbud) cannot be used alone because it requires the right
earbud for Bluetooth transmission.
Resetting the earphones to the factory default settings/Reset
If the function of the earphones is disturbed:
▷
Insert both earbuds into the charging case and wait at least 10
seconds before taking the earbuds out of the charging case and
switching them on again.
If the function of the earphones is disturbed and switching them off
and on again does not improve, reset the earphones to the factory
default settings. This deletes, among other things, all pairing set-
tings.
▷
Make sure that the contacts on the earbuds and in the charging
case are clean and make contact (the LED of the charging case
lights up when you insert the earbuds into the charging case). If
necessary, clean the contacts (> 29).
▷
Use the USB cable to connect the charging case to a power
source > 14).
▷
Insert the earbuds into the charging case and, within 30 seconds,
touch and hold the right and the left touch control panel for
5 seconds.
The earphones are reset to the factory default settings.