3. Answer /end phone call
Press button to answer calls，then press button to end calls.
Longpress button to hang up call directely
4. Volume control function
volume up, volume down
5. Mute
5.1 Press mute on main unit, all microphones are muted, press mute
on extension microphone, the corresponding microphone is muted.
When microphone is working, the status lighting is white,
and when it is muted, the light is red.
6. Auto Power Off
When device is not connected more than 15 minutes,
it will shut down automatically.
7. Battery indicator
Connect device by USB, it's charging and 5 dots in green light show
battery level. When device is not charging, a short click on power on/off
button, the 5 dots in green light show battery level.
5 dots breath light: battery low level and needs charge
