The SteelSeries Siberia v2 Full-size Headset was developed in cooperation with professional gamers to ensure that the soundscape and design would meet the demand of gamers and audiophiles. The improved multifunctional headset was designed with new thicker leather ear-cups for outside sound isolation while remaining lightweight with its trademark headband suspension for premium comfort during long periods of game play. As an upgrade from the original SteelSeries Siberia Headset the new v2 sports a retractable uni-directional microphone for convenience in switching the headset from gaming on your PC or XBOX to listening to music on your Mp3 player. The USB version features a 7.1 virtual sound USB soundcard that which is a great alternative for your on-board soundcard.The USB version supports the following systems: Win XP/Vista/Win 2000/Win 98/Win ME. While the USB sound card is not compatible with Mac however the headset itself is.