When the Mill kitchen bin is running a Dry & Grind cycle, the fans sound like white noise and are about as loud as a dishwasher (~44 dB). Listen here. If you put in pits or bones, you might hear a quick, loud snap or clunk. Every now and then it might make a funny creak or groan as it mixes.
The bin’s fans run at a super low-energy speed throughout the day to help maintain a negative air pressure so that the bin stays smelling fresh.