Logitech Wireless Gaming Headset G930 with 7.1 Surround Sound (Certified Refurbished) Noise-cancelling boom mic: Reduces background noise and auto mutes when rotated up Three programmable G-keys: Customize with one-touch commands over chat clients, voice morphing and more Gaming-grade wireless: Reliable lag-free performance with up to 40 ft. wireless range (Actual wireless range will vary with use, settings and environmental conditions) Immersive 7.1 surround sound: Advanced Dolby technology delivers detailed positional audio. This Certified Refurbished product is tested & certified to look and work like-new. The product is backed by a 90 day warranty. You need to initialize the unit for the headphones. The USB receiver has a small pin hole - Plug the receiver in a USB slot on your PC then put a paper clip inside the hole - Hold it down till the light blinks fast. Then power on headphones. Wait about 5 seconds - Press the power button and hold it down until the green light goes solid. Blinking lights mean the headset and receiver are not communicating.