The Omega Paw Roll ‘n Clean Plastic Indoor Outdoor Automatic Self Cleaning Litter Box is a self-cleaning litter box that is perfect for use with cats. This litter box features a simple roll to clean discharge method that eliminates the need for daily scooping, and the heavy-duty sifting grate ensures that only clean litter is left behind. The box also includes a pullout waste tray for easy disposal, and the dimensions are 21.5″ L x 18.5″ W x 20″ H.