By adjusting the snap, you can customize the way your cats enter and exit the litter boxes, which can meet the needs of cats with different personalities and physical conditions. When using a swing door, cats can freely come and go, making it convenient for kittens, short legged cats, elderly cats, and overweight cats to use this kitty litter box to protect their joints. When using a one-way door, cats can only enter from the front door and exit from the top. The large-area sand trap pedal can effectively trap the litter on the cat's paws and prevent litter from scattering everywhere.