... Foldable 2, Bluetooth 2.1 wireless 3, High quality Products descriptionBluetooth wireless headsetSupport systems:audio equipments with bluetooth functions,such as PC ... 2.0Battery:rechargeable lithium-ion polymer battery (3.7V/320MA/h)Successive working time:about 8 ... :30Hz-16.000HzOperating voltage:3.0v Wireless stereo bluetooth headphone foldable new style for computer, PC, Ipad, Ipod, Xbox etc ...