SmartScoop Self-Scooping Litter Box automatically scoops waste 15 minutes after your cat leaves the box, trapping waste in an odor locking compartment. The motor unit travels outside the box, protecting it from litter and waste. SmartScoop Self Scooping Litter Box pan size is 17" x 14" X 2". Use any clay clumping litter. Box includes litter catching ramp, 3 activated carbon filters, 12 replacement waste bags, and a 1.5 oz no stick spray and odor control spray. Additional Odor Control Spray (8 oz), No Stick Spray and Charcoal Filters (12 pack), sold separately.