It can work
My mother-in-law lives in a secluded area festered with rats.  Her house is a trailer which is not the ideal setting for the whole house 1000x, since there are separate rooms that cannot receive the signal and the rats live under the trailer, and the sound is not supposed to penetrate the hard floor--but apparently it does.<br />Since I plugged in the device the rats have disappeared.  So I fired the exterminator.
Rating: 5 stars