1. Original new design 2. Hi-Fi sound quality in-ear Earphone 3. CE, FCC ,RoHS compliant 4. OEM service offered ... +/-5%Frequency Response20-2000HZ Impedance16ohmRated Power3mwMax. Power15mw Application Mobile phone,computer,MP3/MP4/MP5 player,radio,media player,Ipod and so ... . All Can Be Customerized As Your Requirements Hi-Fi In-Ear Stereo Earphone