The guitar to USB interface cable is plug-and-play. There is no need any external power or any other hardware. With this cable, you can plug in your favorite guitar and turn your PC or Mac computer into a guitar amp and recording system. The stereo Headphone output lets you jam with your computer and can also be used formonitoring with active monitor speakers. - 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 - Audio Quality: 24-bit, 44.1/48kHz - System Requirements: MacOS 8.5, 8.6, 9.x, OS X, Windows XP SP2, Windows Vista Win7