The thin, lightweight XT2 system delivers excellent sound that comes from four full-range neodymium micro drivers and bass enhancement technology. Connects easily to laptops and desktops via USB port. The XT2 can be powered by your laptop but comes with its own power supply for an optional audio boost. Whats more, its compatible with the BB2001 subwoofer, for those who really want thumping, full-bodied sound. Built-in metal stands keep the speakers upright in almost any setting. And the XT2s built-in microphone is perfect for Internet communications.