Karaoke lovers will be happy to note that with the doPi system, karaoke just became as portable as an iPod. The way it works is simple. Plug your iPod into the doPi system, and attach the doPi to your TV and voila, you've got a fully functional (and definitely entertaining) karaoke system. To see the lyrics on the TV you need a video mp3 player and mp4 file, but for just plain music any mp3 will do.
Added from www.dopikaraoke.com