Sades Sa-903 7.1 Sound Effect USB Gaming Headset Headphone Earset Earphone with Microphone Black/Red Loudhailer diameter:40mm(NdFeB) Frequency range: :20~20.000Hz Sound effect: 7.1 simulated sound channels Sensitivity:112dB +/- 3 dB at 1 khz Impedance:32 Ohm +/- 15% Max Input power:30mW Mic Dimension:6.0*5.0mm Mic Frequency Range:50-10KHz Mic Sensitivity:-38dB +/- 3 dB Mic Impedance:2.2K at 1khz Cable length:Approx.3.0m Approximate Weight: 370g/ 0.82lbs Input Plug:USB (USB connection provides power) Physical production:driver CD