I've really become addicted to the little blue machine. [Wait. That didn't sound right.] The drones are very soothing. I have turned it off for the moment, though. One of my neighbors has hired a cleaning service. The van is parked near my studio and the apparatus is making a droning sound that, for the moment, is quite soothing. I also like that the sound is involved in creating a sparkling clean office for someone.