Ear Force HPA2 5.1 Surround PC Gaming Headset 5.1 Surround Sound - True 5.1 channel surround sound from 8 speakers Amplifier - Built in amplifier with volume controls for all 5.1 audio channels Independent Controls - Heart-thumping bass boost adds sonic realism Smart Mic - Eliminates game sounds picked up by chat mic Microphone Monitoring - A USB connection provides power - no AC adapters or batteries necessary