hang up the call.
6.5.3.
When there is an incoming call, long press
and hold the
“ ”
key for 3 seconds to reject
the call.
6.6. Mute microphone
When the device is connected to Bluetooth or
connected to an AUX audio cable or USB cable,
briefly press the microphone mute key to mute
or unmute the microphone.
6.7. Volume adjustment
Press volume "+" and volume "-" keys to increase or
decrease the volume accordingly.