Bluetooth version: version 5.2 Bluetooth distance: about 10 meters Headphone battery: 300MAH Rechargeable battery: 2200MAH Listening to songs, talk time: about 68 hours Charging time: about 2 hours Universal for left and right ears, rotatable Battery-type lithium polymer battery Support protocol HEP\HSP\A2D\AVRCP Process material: ABS+plating+food silicone ear caps Frequency: 20Hz-20KHz Impedance is 32 ohms Sensitivity 85dB/mW
