pay4save Sades 7.1 Simulated Sound Channel Game Headphones Gaming USB Headset CF CS LOL-Retail package 7.1 USB sound card delivers thrilling surround sound with separately adjustable levels Sound effect: 7.1 simulated sound channels Frequency range: 20~20.000Hz Sensitivity: 111dB  3 dB at 1 khz Impedance: 16 Ohm at 1 khz