(p.s. individual 2 litter robot 3 and the two of them are not working as anticipated, not often detecting my cats and sometime just freeze in middle… had the wifi board installed and was never in a position to connect Hence the app is non-exist for me…) Look for kinds https://archermerck.tribunablog.com/indicators-on-clean-cat-litter-box-you-should-know-47618854