The Cricut JukeBox will allows you to use up to 6 cartridges at a time without swapping them in and out of the machine. Just connect it to your Cricut Original or Cricut Expression Machine and insert up to 6 cartridges. You can also link up to 3 Cricut JukeBox core units and use up to 18 Cricut cartridges at a time! The Cricut JukeBox works especially well with Cricut Design Studio. The storage bin below the cartridge rack is for books and keypad overlays, storing up to six books and overlays in the base, making this a unique storage system also.