PetSafe ScoopFree Self-Cleaning Clumping Litter Box for Clumping Litter – Superior Odor Control – Never Scoop Litter Again – for Single or Multi-Cat Households. AUTOMATICALLY REMOVES WASTE: This automatic litter box rakes up your cat's favorite clumping litter, trapping clumps and odors. COMPATIBLE WITH CLUMPING LITTER: Works with clumping litter and most other litter types. No trays needed GREATER ODOR CONTROL: The ScoopFree Self-Cleaning Clumping Litter Box's innovative rake system and waste compartment trap unpleasant odors FILL IT, LEAVE IT, RENEW IT: Empty the waste compartment about once a week, periodically refill the litter and you're done. EASY TO CLEAN: The waste compartment, litter tray and rake are easily removed for cleaning and refilling. Ideal for single or multi-cat households.