Purina Petivity Health Monitoring Cat Litter Box Small System, 5.5 lb. Box

I have been pleasantly surprised by this monitor. So, we have a unique story behind this. Several years ago we brought home a stray kitten from a community colony because we could tell he needed medical attention. He was a small little thing, didn't have a tail, and walked funny but we thought that he was a Manx (there were several others in the colony). After bringing him home, cleaning him up, and taking him to a vet, we found he had a very severe tail pull injury which left him with nerve damage in his hind end. We didn't realize exactly how extensive it was but we have found he can't completely control his body functions and we have to monitor him closely for constipation. Fast forward: Last year, we brought home 3 more cats from the colony (to vaccinate, fix, and adopt out or release) but have decided to keep them. We have been trying to figure out how to get all of them to be able to live together in one space but monitor them the way we need to. While we have only used one monitor on the cats that don't have health issues (we wanted to test it out before merging all the cats) we have been really impressed. It does a great job at differentiating between the cats, keeping track of body functions, and giving us notifications of things like weight changes and lack of visits to the box. I think this will be the perfect answer to our very particular need.