Headset wireless bluetooth headsetTransmission distance: less than or equal to 10m Battery capacity: 300mAh Charging voltage: DC5V Speaker diameter: 40mm Impedance: 32 Working time: playing music 4 6h, talk time 8 10h Bluetooth version: 4. 0 Microphone: Outside Rated power: 100mw Working voltage: DC3. 7V Frequency range: 20 20KHz Headphone instruction Turn on: Long press the key for 3 seconds until the red and blue lights flash alternately, then let go Shutdown: Press and hold the key