... soft earpads provides a secure and comfortable fit even for extended use· Optimised for portable audio including MP3, CD players, iPad, iPod and iPhone. Specification Drive unit ... 9.2mm Impedance32ohmSensitivity-100dBmFrequence range 20-2khzFunctionstereoWiresTPE cableUsageIpod,Ipone,MP3,MP5,CertificateCE,Rohs,FCC skull earphone for iphone,MP3,MP4 ...