I said in my previous comment, it’s a 4th gen Litter Robot. The 5th gen and 5th gen pro are more!! It has been a huge help for my cat that is very particular about her litter box. She wants a clean litter box all the time. If it’s too dirty she pees on things, even if it was scooped the night before. I always scooped daily but it sometimes wasn’t enough. $650 to not play “does this still smell like cat pee” is worth every penny… not to mention the time, water, detergent, etc saved by not washing everything every time she’s cranky.