supply all kinds of airline headphone Material: PPEarpieces:SwivelCable length: 1.2 meter,single wire,cord diameter 2.2mm(some models are two wires)Speaker:30mmImpedance:300 Ohms+/-10% at 1,000 KhzFrequency range:20-20,000HzMagnet:FerriteVoice Coil:CopperRated power:0.04W=40mWMax.Power:100mwSensitivity:109+/-3 db at 1,000 HzChannel unbalance:<3 dBPlug: Two pin plug (single pin plug,bending plug, ...