Listings show multiple approaches: carbon/charcoal and multi-filter cartridges, ion-based deodorizing technology, and pellet-and-pad systems (zeolite pellets over absorbent pads) that lock urine away and reduce tracking.
Maintenance varies by model: many are cleaned by spot-wiping or washing with soap and water and some are fully hand-washable. Automatic units add sensor- or timer-based self-cleaning (one-click or scheduled), app control, and programmable cleaning cycles.
Most listings target cats in the ~14–18 lb range; one lists support up to about 19 lb. One automatic unit specifies a 66‑liter toilet area plus a 9‑liter trash bin for multi-day waste storage.
Included items vary but commonly include scoops and trays, spare carbon/charcoal filters, disposable urine pads and pellet refills; self-cleaning units may include extras like garbage bags and a baffle plate.
Common features: concealed litter areas behind sliding or magnetic doors, flat tops for decor/storage, ventilation holes or winding entries for airflow, extra-wide entries and dual-room compartments for multiple cats, and elevated or scratch-resistant bases for easier cleaning and floor protection.