PetSafe ScoopFree Ultra Self-Cleaning Cat Litter BoxIt is the only self cleaning litter box that uses disposable litter trays to provide hands off convenience and unbeatable odor control. ScoopFree Ultra offers 3 additional features for the ultimate in cat care: A privacy hood, an adjustable rake delay, and a health counter. You don't have to see, touch, or smell messy waste. Disposable litter tray has plastic lining that creates a barrier to help protect against leakage. Sensors automatically reset