Bluetooth 4.1 chipset, strong Bluetooth signal, operating distance up to 10 meters; superior Bluetooth compatibility, compatible with all the Bluetooth enabled Smartphones, Tablet PC, Smart TV etcHigh Definition 40mm Speaker Drive Units, HiFi super bass and stereo sound effect.Lower power consumption,built-in 300mAh Polymer Lithium Battery, music playback time up to 8 hoursPerfect human ergonomic design, adjustable head beam, soft breathable protein earmuffs, comfortable to useEasy access,Volume/Phone Controller? on/off, answer/hang up, pause/ play, FM Radio/control volume. A built-in remote Mic for your hands-free callaSD Card With Built-in FM Radio