Bluetooth version: V5.3 Bluetooth operating frequency: 2.402GHz -2.480GHz Speaker unit: Φ 16.2mm Frequency response: 20Hz~20KHz Charging box battery capacity: 902025/400mAh Music time: 10-11 hours (70% volume) Talk time: 9.5-10 hours (70% volume) TYPE-C charging time: 2 hours Related