A self-cleaning cat litter box. A smart litter box also reduces odor by scooping waste into a separate compartment at various intervals. Unlike a standard litter box, smart litter boxes require the periodic replacement of cleaning cartridges and litter trays that can cost several hundred dollars per year in a multiple-cat household. In addition, it takes time for the cats to get used to the machine, and not all pets are able to adapt. See
smart.