Stereo earphone for MP3/ MP4/Mobile phone/ Walkman/Computer *Speaker diameter:10 mm *Mylar: 6U * Impedance: 32 ohm/16 ohm *Sensitivity: 105+/-3dB, S.P.L. at 1kHz *Frequency response: 20Hz-20,000Hz *Input power : Nom 2mw, Max 4mw; * Distortion : Less than 5% at 1KHz 2mw; *Cord length: 1.25 m *Plugs type: 3.5mm stereo *Material of the earphone shell: Metal