Feather: 1) OEM brand 2)Customerized 3)Easy-to- carry 4 )Waterproof Earphones flat cable / Stereo Earphone Specification:Speaker diameter :φ16Impedance: 16Ω Sensitivity: 110±3dB at 1KHZ Frequency Response: 20-20,000HZRated Power: 5mWCable length: 1.2MPlug: φ3.5mmApplications: MP3,MP4 player, CD player, Radio, and so on. Cell phone Flat cable handsfree / Stereo Earphone