We had rabbits tearing up our yard and we put out two and they were gone within a few days. The sound doesn't bother any animal above ground which is great if you have a dog.
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I wasn't sure if these would do the job or even last long but the have done both. No critters and they are still running 3 months later.
I deployed these next to my horses shed. I haven't come across any mice in his hay since. In all fairness, I also deployed two Simpletek No Mouse in the House peppermint balls in the shed at the sam time. Therefore, I don't know for sure if one or the other or both effectively got rid of the mice.
I expected more - but the result is such + the fact that you do not need to charge them
