I bought several of these about three years ago as I had a mouse problem in my RV. Plugged them in and have never had another mouse (or for that matter, no pests at all, cockroaches, spiders, etc.) Bought a few for my house and no pests again. Once in a great while, I will see a cockroach or a spider, but it is laying on its back and cannot move. The sound just really keeps them away. My dog does not have a problem either in the RV or the house.
Pros and Cons:
Bottom Line: Yes, I would recommend this to a friend
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