Two trays included. Patented design allows options as the tray becomes an enclosed litter box. Moisture barrier interior allows the litter to perform its job. Very tall size litter box as each tray is 19x17x9.5 inches. The 8.5 inch sides reduces litter scatter. Optional perforated opening for senior cats and kittens. Used daily by the owner and her Sassy Cat. U.S. patent 9,258,977.