Bluetooth Version4.1Support A2DP1.3HFP1.6HSP1.2AVRCP1.6Dl1.3Frequency2.4GHzSingle ear Transmit range~10mTwo ears Transmit range ~8mBattery65mAh for left and right oneCharge time 1.5hoursstandby time~120houursworking times~2 hoursimpedence 50ohm