Smart AUTO REFILL System: LALAHOME automatic litter box self cleaning detects the level of the toilet tray, and refills litter itself when cat litter is not enough. The automatic litter box ensures your cat's litter bed remains consistently dry, clean and sufficient. A single cat can go for about two weeks. NOTE: Adjust the actual number of litter cells through the settings in your mobile app after manually refilling the top compartments. Integrated SAFETY PROTECTION for Multi-Cat Households: LALAHOME cat litter box automatic cleaning equipped with multi sensors to keep cats safer. Weight sensor, anti-pinch and dog-proof design.