Bluetooth key description
1. Power on / off / hold / play button
2. Volume plus key / next key
3. Volume down key / previous key
4. Mitou hole
5. USB charging port
Bluetooth basic parameters
Transmission distance: CLASS Ⅱ
Operating range: 10 meters
Battery capacity: 180MAH
Frequency range: 20-20KHZ
Sensitivity: 95DB
Impedance: 32 ohms
Speaker size: 32MM
Charge time: 2H
Voice continuous talk time: 4-6H
Bluetooth music playback time: 3-6H (70% volume status)
Bluetooth: answer / end / reject / transfer, call waiting, redial, mute, volume adjustment, multi-point connection, listen to music / pause / play.