Product Description: Our innovative, self-cleaning 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.No Scooping, No Odor, No Mess.You'll save precious time with our automatic Simply Clean litter box system and your cat will be quite pleased with the "fresh and ready" litter box that's no longer dependent on your schedule. So whisper-quiet, you'll be tempted to put your finger on the rim of the bowl just to make sure it's actually working. There are no visible moving parts to catch paws or tails - or to bother your cat when he's using the unit.