Hearphones with 3.5mm diameter stereo plug , and With high quality sound . *Ultra-slim hearphones*Type:Closed*Drive:28mm*Sensitivity:102dB*Frequency response:16~24,000Hz*Power handling capacity:500mW*Impedance:20Ω*Jack:3.5mm*Cord length:1.2M*100% quality ultra good stereo,compatible with all iPod, MP3, CD, DVD, MD, PSP and other audio devices headphones