Inner ear hearphones With high quality sound ,compatible with all iPod ,mp3,CD,DVD,MD ,PSP and other audio devices *Inner ear type stereo headphone*Drive:13.5mm*Sensitivity:99dB*Frequency response:20,000Hz*Power handling capacity:5mW*Impedance:32Ω*Jack:3.5mm*Cord length:1.2M*100% quality assurance ;compatible with all iPod, MP3, CD, DVD, MD, PSP and other audio devices headphones