I really should have avoided purchasing two of these litter boxes, they are incredibly expensive and they stop working after a very short time. The last one I purchased did not work out of the box and I live several hours away from the store where I purchased it. Now I have to wait six weeks for my replacement after spending $125.00 on a product that doesn't work. I suppose it is my own fault for buying a second unit after the first unit stopped working after three months. I hope that everyone reading this will avoid making the same mistake. This is really frustrating.