I have heard of these ultrasonic pest control gadgets but have never used them before. I was tired of using chemicals to get rid of my bug and rodent problem. I have a cabin in the woods and we will get mice from time to time. I have now had this installed now for several weeks and no sign of anything. Usually when we go away for a few day and find some dropping when we return. Nothing yet so far. I am hopeful. There is no sound or odor. If the critters stay gone I'll change my review to a 5 star.
Finally no chemicals