LitterMaid LME9000 Elite Mega Advanced Automatic Self-Cleaning Litter Box Self-cleaning litter box for extra-large cats or multiple-cat households Infrared sensor detects and rakes waste away 10 minutes after cat leaves Timer automatically resets upon re-entry; paw-cleaning ramp; "on/off" switch 4 carbon filters, 4 waste receptacles, and ionic air cleaner for reduced odor Measures 28 by 20 by 8-1/2 inches