... earphone,etc. By many years manufactoring experience, we have organized a professional designer/engineer team for the whole production line, as ... for Mp3,Ipod,Iphone.Specification Drive unit: 10mmsensitivity:97dB/1mW(S.P.L at 1KHz) Impedance:32ΩFrenquency Range:20Hz-20KHzRated power ...