http://cat-windowperch.com/littermaid-elite-mega-automatic-self-cleaning-litter-box – Make your cat healthier and happier with the LitterMaid Elite Mega Automatic self-cleaning litter box that is ideal for extra-large cats or multiple cat households. Once the cat leaves the unit, sensors are triggered to turn on the ionizer and timer. After 10 minutes, the cleaning cycle starts and rake moves clumps toward the waste receptacle. The rake opens the waste receptacle cover and deposits clumps before closing cover and returning to the home position. Sealed disposable waste receptacle with carbon filter allows for safe, easy disposal of waste. This box is not commercially rated; it is for residential use for 2-3 cats.