Specification1.Driver: 12mm 2.Impedance: 32 OHM 3.Bluetooth version: Bluetooth v5.0+EDR 4.Bluetooth use band: 2.4GHz 5.Power level: CLASS II 6.Output power: 30mW 7.Bluetooth distance: 10 meters barrier 8.Frequency response: 20-20000Hz 9.Operating voltage range: 3.0V-4.2V 10.Battery capacity: 3.7V/ 50 mah11.With A2DP / AVRCP high quality stereo audio transmission and remote control protocol 12.Powerful noise de-noising circuit (active noise reduction) 13.Talk time: Up to 2hours 14. Music time:Up to 2hours15.Charging time:1.5-2 hours16.Wireless Charging: Qi enabled devices