Simply load ScoopFree with the disposable litter tray pre-filled with Premium Blue™ crystal litter. Whenever your cat uses the litter box, the crystals instantly absorb moisture and odor and start to dehydrate solids. Twenty minutes later, ScoopFree's rake automatically sweeps the waste into a covered compartment, leaving the litter smelling clean and fresh. Replace the disposable tray every few weeks, and the litter box is just like new. ScoopFree now comes with NEW & IMPROVED features: A quieter motor, a new anti-leak guard to protect against sideways urination, upgraded components, & recyclable packaging.