Easy Plug and Play Installation - USB bus powered-Requires no external power - Stereo Headphone output lets you jam with your computer and can also be used for monitoring with active monitor speakers - Plug in your favorite guitar and turn your PC or Mac computer into a guitar amp and recording system without the need for any other hardware - High-quality components and exceptionally rugged construction ensure long life - Variable-speed files playback function for MP3 WAV AIFF audio files' perfect for easy learning and practicing - System Requirements: MacOS 8.5 8.6 9.x OS X Windows XP SP2 Windows Vista