"Product parameters Brand name:KZ Model name:KZ-SKlOPro Earphones battery life:6H(It depends on usage) Earphone battery capacity:48mAh Charging case battery capacity: 400mAh Chargingtimes of charging case: 3times Bluetooth Version:BT5.2 Bluetooth Chip:QCC3040 Signal Transmission Protocol:APTX/AAC/SBC Charging Port:TYPE-C Transmission distance:15M The above data are kZ acoustical laboratory measurements,and actual use may vary slightly depending on the circumstances "