Noiseless Pull-and-Refresh process to refresh the cat litter pan and collect waste .Made of BPA-free materialsSuitable for all clumping litterRefer to the attached user manual and videos below for usage Litter clumps fall into the cat litter tray’s pull out waste drawer for easy disposal; clear-view window to monitor the litter The covered cat litter box has a large entrance that is suitable for cats of all sizes Integrated carbon filter for optimal ventilation The cat litter box design has an easy access maintenance door to assist in adding new litter and a clear view window to monitor the litter Includes 2 tight-fitting cat litter liners to keep the litter box and the waste drawer clean; suitable for all clumping cat litter The amount of litter should not exceed 11 pounds or 305 cu. in. Made of BPA-free materials Suitable for all clumping litter Refer to the attached user manual and videos below for usage