1. Easy Plug and Play Installation. USB bus powered--Requires no external power. 2. Stereo Headphone output lets you jam with your computer and can also be used for monitoring with active monitor speakers. 3. Variable-speed file playback function for MP3, WAV, AIFF audio files perfect for and practicing. 4. USB Guitar Link Cable is a professional tool that enables you to turn your PC computer into fantastic working platform on which you can use the classic effects, in the studio as well as . 5. Support OS: Windows XP (SP2) and Windows Vista,for OS 8.5 or above. colour:Black+white Material:plastic size:26 x 14 x 1.3cm Package Contents: 1 x guitar USB audio interface 1 x English manual 1 x disc Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.