Litter Robot 3 Connect with ramp and Whisker OdorTrap pod and refill. It's probably about 3 or 4 years old and well-used, but it has been deep cleaned and it still works great. The inside liner and pressure sensor have both been replaced, so are newer. It was gifted to us from family who had already registered it with their account, so we've never been able to use the connectivity feature, so that may not work. Might be able to contact Whisker to try to reset it, but we never bothered trying. We'd still be using it, but we got a new cat that isn't compatible with it. Most cats can be introduced to it slowly (start with it off and use Dr. Elsey's litter attract, then start cycling once they're comfortable using it normally). These go for $550 new