Bluetooth Version: V5.1System: True StereoBattery: 3.7V lithium battery, 30mAh 300mAHCharging time: about 1.5 hoursWorking time: about 4.5 hoursCharging box working time: about 3 TimesStandby time: about 280 daysOperate: touch multi-function (answer, cut songs, hang up, adjust volume)warranty : Six months replacement