Stereo earphone for MP3/ MP4/Mobile phone/ Walkman/Computer *Speaker diameter:15mm *Mylar: 6U*Impedance: 32 ohm/16 ohm*Sensitivity: 115+/-3dB, S.P.L. at 1kHz*Frequency response: 20Hz-20,000Hz*Input power : Nom2mw,Max4mw;*Distortion : Less than 5% at 1KHz 2mw;*Cord length: 1.25 m*Plugs type: 3.5mm stereo*Material of the earphone shell: Plastic