Speaker: 40mm Chip: Broadcom (2.4G BK2635 Bluetooth BK3288X) Impedance: 17±15 Sensitivity: 106±3dB Frequency response: 20Hz to 20kHz Microphone sensitivity: -42±3dB Wireless distance: 10m Plug: 2.4GHz BT Type-C Audio cable 3.5mm Audio cable Lithium battery: 600mAh 3.7V 2.4G working hours: 23 hours Bluetooth working hours: 26 hours Charging time: about 3 hours Charging method: (Type-C) USB 5V Product weight: 186.6g