Bluetooth Version: V5.2System: True StereoBattery: 3.7V lithium battery, 30mAh 320mAHCharging time: about 1.5 hoursWorking time: about 4 hoursCharging box working time: about 2 – 3 timesStandby time: about 300 daysOperate: touch multi-function (answer, cut songs, hang up, adjust volume)warranty : Six months replacement