Ear Force X31 Digital RF Wireless Game Audio + Xbox Live Chat - Manufacturer Refurbished Digital RF Wireless USB Powered Analog Stereo Inputs Adjustable Mic Boom Independent Game Volume Independent XBOX Live Chat Volume Amplifier Mic Mute Switch Bass Boost Microphone Monitor Oversized Ear Cups Stereo Expander Chat boost Headphone Speaker Size 40mm Battery Auto Shut-Off Battery Life &gt; 20hrs; Range up to 30