Earbuds Bluetooth Version5.2Earbuds SystemTrue StereoEarbuds battery3.7V lithium battery, 40mAh 400mAHEarbuds Charging timeabout 1.5 hoursEarbuds Working timeabout 4.5 hoursCharging box working time2 timesEarbuds Stand by timeabout 300 daysEarbuds OperateSupport Active Noise Cancellation (ANC), ENC call, support AAC, mSBC high-quality decoding, TWS communication, balance efficiency and power consumption, touch multi-function (answer, cut songs, hang up, adjust volume)