... sound quality 2,Min Size 3,Lightweight, 4,Mobile enhancement Bluetooth Version:2.1Operating Distance: 10mBattery: Battery Built-in rechargeable li ... :YesMulti-function Button On/Off:YesStandard Bluetooth Features:YesStandby Time (hrs):80Supported Profiles:A2DP,AVRCP, Headsets, HandsfreeTalk Time (hrs):4 Portable mini bluetooth headphone