The PetSafe Simply Clean™ Litter Box System is the only cat litter system that cleans and removes waste continuously and automatically. The ingenious Simply Clean™ system removes waste from the litter box to a built-in waste container via a quiet, slow-moving Conveyor System. The cleaning action is automatic and runs 24 hours a day. With the Simply Clean™ Litter Box, odor and the bacteria that cause it are reduced. Your cat's litter box is always fresh and ready for use. Clean and safe, the Simply Clean™ Litter Box System will save you time while keeping your cat healthy.Features and Benefits:Continuously cleans without disturbing your cat.Unit moves at one rotation per hour.Quiet operation- no initiation or running sound.Great for nighttime use.Economically and environmentally safe- uses recycled plastic shopping bags.Easy to clean.Reduces odor and odor-causing bacteria.No tools required for assembly. Safe, no moving parts.For cats up to 12 lbs.