Supported protocols: HFP, A2DP, AVRCP, AVDTP, AVCTP, GAVDP, SDP Battery capacity of earbuds: 33mAh*2without protection board but IC Battery capacity of charging case: 300mAh with protective plate Play time: 6.5h Talk time: 5.5h Charging time: 1h Standby time: 300h Horn diameter: 13mm Frequency response range: 20~20kHz Bluetooth operating frequency: 24022480MHz Maximum transmission distance: 10m Sensitivity: – 38 ± 1dB Voice prompt: supported Multipoint connection: unsupported Wearing method: in the ear User manual: Chinese and English Interface: TypeC Waterproof rate: IPX4