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I'd suggest that the appearance of the device and disappearance of the rat are coincidental, I've tried them against foxes, mice and rats with very little effect.

I used one for insects -- cockroaches, in particular -- when I was in Los Angeles, and it seemed to work well enough. I used to find roaches on a weekly basis prior to using it, and, afterwards, I never saw them in the garage again.

Of course, it's kind of like "this here rock keeps tigers away." I can't prove that the device itself kept them away, simply from their absence.