I am deeply disappointed with the ELS Pet Litter Box. This machine has been nothing but a headache since I purchased it. The frequent malfunctions are bad enough, but the final straw was when the door locked my cat inside the litter box. This led to a serious injury, causing my cat immense stress. A litter box should be safe and reliable, but the ELS Pet Litter Box is neither. I cannot in good conscience recommend this product to any pet owner. Save yourself the trouble and find a more dependabl...