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20 AAA alkaline batteries.

Wireless bluetooth handsfreeBluetooth version V4.2Battery life Talk /music time - 6 HoursBattery - 55mAhOperating range - 10 metersSupport HSP,HFP,A2DP,AVRCR.Enjoy stereo music from stereo A2Embedded mic for hands-free conversation from BTS-enabled cell phonesVolume controlMultiple Pairing to 2 BT devicesCompatibility UniversalMicrophone YesAccesory type Bluetooth headphonesConnecting Single PointDesign In earColor - Black