... headsetSupport systems:audio equipments with bluetooth functions,such as PC,cellphone,MP3…Bluetooth standards: Bluetooth V2.1+EDRReceiver range ... ratio:_82db;Charger power:computer USB interface DC5V;DC5V(500MA);travel charger;DC 5V (500MA)car chargerSpeaker parameterSpeaker diameterφ40 ... 0v Wireless stereo bluetooth headphone foldable new style for computer, PC, Ipad, Ipod, Xbox etc with microphone