This is the litter box that does not have to be changed or managed for up to 21 days. The non-clumping litter crystals immediately absorb liquid waste and odor and begin to dehydrate solid waste, allowing the litter to last up to 3X longer than traditional litter. A sensor detects when the cat leaves the litter box and the built-in rake automatically combs through the litter, sweeping solid waste into a receptacle that automatically closes to keep waste and odor contained. The litter is held in a disposable tray that removes easily and eliminates the need to scoop out litter in small amounts. The integrated LCD panel tracks how many times the litter box is used and allows you to set the rake to comb through the litter five, 10, or 20 minutes after the cat exits. The litter lasts up to 21 days when used by one cat; up to 15 days for two cats. Includes one litter tray (with litter) and a removable hood. Plugs into AC. 16 3/4" H x 19" W x 27 1/2" L. (21 lbs.)