I have a 20gb phatbox on my treg. You need to connect the CD changer wire into the adapter that comes with the phatbox. You do not get much display info on the screen however the buttons give you voice information such as artist,album etc. Navigating to tracks are a chore best to set up playlists via the PC software and use the shuffle. Sound quality etc is top notch and you can fit over 2000 tracks on a 20gb no problem.