Catlink Young Self-Cleaning Litter Box*Based on our lab tests, we've determined the optimal replacement schedule for each part. To keep your device performing at its best and simplify ordering, we offer curated 3, 6, and 12 month maintenance kits. Safety First: Stable triangular design, anti slip base, gravity + anti pinch sensors, and panel lock. Plug & Play: No assembly required just plug in and go. Easy Operation: Full control panel with intuitive layout, suitable for all age groups.