Sennheiser CX 400BT Series Instruction Manual page 18

Using the earphones
18 | CX 400BT True Wireless
4. Simultaneously touch and hold the right and the left touch control
panel for 10 seconds until you hear the voice prompt "Pairing" and
a beep.
The LEDs of the earbuds flash green and red. The earbuds are in
earbud pairing mode.
If pairing was successful, you hear the voice prompt "Pairing suc-
cessful" and the LEDs of the earbuds flash blue 3x.
▷
Now pair the earbuds with your Bluetooth device (> 16).
1
Bluetooth off
L
3
max. 50 cm
2
USB-C
USB-A
R
4
Hold 10s
"Pairing"
"Pairing
successful"
3x