PetSafe's Simply Clean Self-Cleaning Cat Litter Box System is both economically and environmentally friendly. No additional accessories to routinely purchase or needed to maintain the PetSafe Simply Clean Litter Box System. Conveniently use simple recycled grocery bags to line the waste receptacle for a fast and affordable cleanup. Of course, the unit isn’t only easy on your wallet and the planet; it’s also easy on you and your favorite feline. Eco-friendly. No special bags required. No scooping necessary. Quiet and simple to use. Bowl moves one complete rotation in an hour. No batteries needed – uses low-voltage AC adapter. Continuously cleans without disturbing your cat. Reduces foul odor and odor-causing bacteria.