It 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 the 20-minute rake timer if your cat re-enters the litter box. Rigorously tested in our lab for more than 100,000 cycles without failure or jamming. Anti-tracking carpet sold separately. Recommended litter tray replacements: At least once every 20-30 days for one cat, every 10-15 days for 2 cats, every 7-10 days for 3 cats. Product Specs: Includes UL-rated 120V 60Hz adaptor. Operates on a standard wall outlet. For indoor use only. extra-long 10 foot power cord. Self-cleaning litter box measures 19” wide by 27-3/8” long by 7” high. Height is 16-3/4” with optional hood installed. Litter tray measures 14-1/2” wide by 22” long by 2-1/2” high. Never add litter to your ScoopFree self-cleaning litter box or use another brand or type of litter. The Premium Blue crystal litter in the disposable litter tray is formulated especially for ScoopFree. Kittens less than 6 months old may experience a shortened litter tray life span. Kittens may also have softer stool than mature cats, which increases the likelihood that it may stick to the rake. Cats who consume a diet high in crude fiber, ash and byproducts may experience a shortened litter tray life span. Cats over 10 years and cats with health problems may also experience a shortened tray life. Privacy hood gives your cats the privacy they deserve while keeping the litter properly contained Adjustable rake delay allows you to choose if the automatic rake sweeps waste 5, 10, or 20 minutes after your cats use the litter box Health counter tracks the frequency of your cats’ litter box usage to help monitor their health Uses disposable litter trays to provide hands-off convenience and unbeatable odor control. Includes disposable litter tray pre-filled with Premium Blue Crystals.