Hi Besnier! What on earth is the distance among the litter box and the cats? In fact the Litter Robot would make noise but is not that noisy possibly. My cat acquired accustomed to that sounds and she or he looks to comprehend the litter box is cleaning cleaned :-) https://bookmarkblast.com/story20249990/the-smart-trick-of-automatic-litter-box-that-no-one-is-discussing