Scoopfree Deluxe Self Cleaning Litter Tray; an easier way to keep your cat indoors. It has sensors inside the box which detect when a cat has been inside and after the cat leaves it rakes the litter box clean. All you have to do is change the cartridge whenever needed (usually once a month for a single cat).
These usually retail for $259. This is an ex-demo model, never been used by a cat just as an in-store display.