Headphone Driver: 1.6-Inch (40 mm)?? Frequency response: 20Hz-20KHz?? Impedance: 32 Ohms?? Sensitivity: 90dB SPL/mW</br>Microphone Pickup pattern: Cardioid (Unidirectional)?? Type: Pressure Gradient Electret Condenser?? Frequency response: 50-20KHz?? Sensitivity: -40dBV/Pa re: 0dB = 1 Pa?? 1KHz</br>Dolby 7.1 Surround Sound?? Seven discrete audio channels?? SYSTEM REQUIREMENTS:Windows Vista?? Windows 7?? or Windows 8USB port</br>Low-frequency effects (LFE) channel?? Rapid-burst transmission</br>Agile frequency?? Noise-cancelling mic</br>Rotate-to-mute mic?? Battery: Up to 10 hours per charge</br></br>Product Description</br></br>Logitech wireless gaming headset g930. a fast wireless connection lets you level up without being tied down-and 7.1 surround sound puts you right in the middle of the action.</br><br/>http://www.amazon.com/gp/product/B003VANOFY