Hello Besnier! What's the distance between the litter box and the cats? In reality the Litter Robot tends to make noise but is just not that noisy possibly. My cat received used to that sound and she seems to be aware of the litter box is cleaning cleaned :-) and https://petskyonline-onlinestrore.blogspot.com/2025/07/petkit-purobot-ultra-premier-auto.html