Description Bluetooth version: 5.3 (7003D8) Supported protocols: HSP, HFP, A2DP, AVRCP Battery capacity of earbuds: 40mAh*2 (without protection board but IC) Battery capacity of charging case: 300mAh (with protection board)    Charging time: 1.5h Talk time: 6h      Play time: 7h Standby time: 300h     Drive unit:Φ10mm/32Ω Frequency response range: 20~20KHz Bluetooth operating frequency: 2.402GHz-2.480GHz Bandwidth: 100KHz-5KHz Maximum transmission distance: 15m Sensitivity: 104±3dB     Voice prompt: supported Multi-point connection: unsupported Wearing method: in-ear   Instructions: Chinese and English    Interface: Type-C    Waterproof rate: IPX6 ENC depth (Four mic for call): ＞- 40dB ANC depth: ＞- 35dB Included accessories: USB charging cable, user manual