Jack:3.5/2.5MM；  L=1.3M,Rated Impedance:32Ω±10%；Frequency:18-22KHZ   Rated Power: 2mw, Max Output Power:5mw F0:200±20%HZ   Sensitivity：105±3dB(at1KHz)  2.5mm/3.5mm jack is available, different color and different length are available