Mouse Repelling Sound Devices

Does anyone know if devices that repel mice and other rodents are for real? Click the link above for an example of one such device.

Here’s the link I meant to post

I don’t see the link. Someone gave me an ultrasonic rat repeller once when I was doing battle with an unwanted guest and, although I never got to see it and the rat together (gee…it must work!), I did try it out on a squirrel who took up residence in a faux beam in my place. The squirrel would look at it, but it didn’t seem to bother him.

The general consensus I’ve seen on the board is that there is no evidence to support the claim that ultrasound repels rodents.