![background image](http://html1.mh-extra.com/html/sennheiser/cx-400bt-series/cx-400bt-series_instruction-manual_1240282017.webp)
Using the earphones
CX 400BT True Wireless | 17
Switching the connection to paired
Bluetooth devices/“Connections”
To selectively switch the audio connection to paired Bluetooth
devices using the “Connections” function, you require the Smart
Control app (> 19).
▷
In the Smart Control app, tap “Connections”.
The list of Bluetooth devices paired with the earphones appears.
▷
From the list, select the paired device to which you want to con-
nect the earphones. Make sure that the desired device is
switched on and Bluetooth is activated.
The Bluetooth audio connection between the desired Bluetooth
device and the earphones is established.
The app connection between the device with the Smart Control
app installed and the earphones remains active (only Bluetooth
Low Energy for communication between app and earphones, the
device name is highlighted in bold).
Disconnecting the earphones from a
Bluetooth device
▷
Via the menu of your Bluetooth device, disconnect the connection
to the earphones.
The earphones are disconnected from the Bluetooth device. The
earphones then search for other paired devices. If no device is
found, you hear the voice prompt “No connection”. The head-
phones switch to idle mode.
Pairing the earbuds with each other
(optional)
The right and the left earbud are paired with each other upon deliv-
ery. If, however, you are using a different earbud (e.g. a spare ear-
bud), you have to pair the two earbuds with each other once:
1. Make sure that the right earbud is not connected to any Bluetooth
device. Deactivate Bluetooth on your Bluetooth device or delete
“CX 400BT TW” from the list of paired devices in the menu of your
Bluetooth device.
2. Charge the right and the left earbud (> 14).
3. Take both earbuds out of the charging case and make sure that
the right and the left earbud are close together (max. distance
50 cm).
The LEDs of the earbuds light up red.
Using the “Connections“ function in the Smart Control app, you
can also selectively connect the earphones to paired devices
without terminating an existing connection (> 31).
If you want to clear the Bluetooth pairing list of the earphones,
reset the earphones to the factory default settings (> 31).