Assist cats that need extra help getting in and out of this self-cleaning litter box with the Litter-Robot 4 ramp. Keep your cat happy and your home cleaner with the Litter-Robot 4 Ramp. These Litter-Robot stairs are designed to fit on the front of your Litter-Robot 4 to make it more accessible and even easier to use. The textured ramp surface helps reduce litter tracking and offers a smooth entrance and exit for kittens or senior cats. The ramp is designed to fit on the front of your Litter-Robot 4 to make it more accessible and easier to use.