... . Use for MP3,MP4,FM,for Iphone,for Ipad,TV,Computer,Netbook and so on. SPECIFICATIONS*Loudhailer diameter40mm*Frequency range20~20000Hz ... at 1KHz110+/-5 dB*Impedance32+/-15% Ohm*Cable lengthApprox.1.5m*Maximum power input100mW*Plug(mm)3.5 Stereo*AccessoryVolume Control Wholesale ...