Say goodbye to another litter box chore. The Litter-Robot 4 LitterHopper handles the task of refilling litter to optimal levels so you don't have to, whether you're home or away. The LitterHopper automatically dispenses fresh cat litter into your Litter-Robot 4, ensuring litter is at the optimal level for your cat's use. Get time back and enjoy added convenience with this hands-free solution to litter refills.*Litter-Robot sold seperately