... after-sales serviceFactory Direct,OEM.earphones used for MP3,MP4,CD,Iphone,computerProduct sepecifications:1. ... 5.frequency respone:20-20.000Hz6.MAX input power:10mW7.impedance:16ohm +-20%8.cord length ... size ,large size ,Middl size and small size .For the color ,black ,white,transparent white ,grey ... with the player ,the following are different jack for reference Color Requirements :We can make every ...