Communications Headset with Microphone, SRS 3D Surround Sound, Passive Noise Reduction, AHS-602i (OEM non-retail packaging) Ideal for Internet Telephone, PC Speech Recognition, Music, Movies, MP3 and Gaming. Noise-Rejecting Microphone with Adjustable Position, Adjustable Sensitivity and Mute. High-Performance 40mm Neodymium Drivers with Closed Ear-Cup Delivers High-Fidelity Sound while Minimizing Distractions from Ambient Sound. Multi-Function Controls: Volume, Mic Sensitivity, Mute and SRS 3D Audio Enhancement. A Single AAA Battery Provides the SRS 3D Enhancement Function but is NOT REQUIRED for Full Normal Operation!