The litter box starts out ok, but it only scoops the poop it doesn't get the pee clumps so the box smells like ammonia quickly. Also it doesn't take long for the motor to die down and it eventually starts clicking and not even scooping the poop. I have been through 2 of these litter boxes both with the same outcome. I don't think any robot litter box will do what a human can do in cleaning properly.