Ear Force X3 Headset: Chat + Wireless Game Audio, for Xbox 360 Stereo Expander to provide a wider sound field for richer, fuller sound Bass Boost - just like turning up the sub-woofer on a home theater system. Automatically adjusts incoming Xbox Live chat levels during loud game moments, so chat from teammates isn't lost in exciting parts of the game play. When the game volume quiets down, the chat level smoothly returns to the normal volume setting. The headphones are designed for long battery life and will automatically shut off Microphone monitoring - lets gamer hear own voice along with other chat