Description Product Description: Bluetooth version: 5.3 (Chip: Jieli AD6973D) Support protocol: HSP, HFP, A2DP, AVRCP Battery capacity of single earbud: 35mAh Battery capacity of charging case: 300mAh Standby time: 300h Color: black Talk time: 7H Play time: 6H (20H at 80% volume with charging case) Charging time: 1H Best transmission distance <1M Maximum transmission distance: 8M Voice prompt: support Impedance: 32Ω Sensitivity: 93±3dB Drive unit: φ10mm Bluetooth working frequency: 2.402GHz~2.480GHz Frequency response range: 20~10,000HZ Multi-point connection: unsupported Wearing style: in-ear Interface: Type-C User manual: Chinese & English Included accessories: USB charging cable, user manual”