... systems:audio equipments with bluetooth functions,such as PC,cellphone,MP3…Bluetooth standards: Bluetooth V2.1+EDRReceiver range:10m / 360.Carrier ... ;Frequency response:20Hz—20KHz;S/N ratio:_82db;Charger power:computer USB interface DC5V;DC5V(500MA);travel charger;DC 5V (500MA ... voltage:3.0v Wireless stereo bluetooth headphone foldable new style for computer, PC, Ipad, Ipod, Xbox etc with microphone