After the cats leave the litter box, the rolling sifting process separates the cat's waste from the clean litter. The specially designed screen can save more cat litter. With a 13L ultra-large waste drawer. An integrated device of self-detection, gravity sensor, anti-pinch infrared sensors, and ventilated and inverted triangle stable structure design, makes sure that no cats will get hurt. Our rechargeable odor purifier and carbon filter effectively eliminate unpleasant odors, formaldehyde, and ammonia. No need to set up wifi, and no app function. The self-cleaning litter box comes fully assembled. During the warranty period. We offer US-based phone customer service and email. Please feel free to contact us if you encounter any issues.