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