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They don't. If they do, results will only be short term.

Just a question you are giving this person an answer and you tell them in no uncertain terms "they don't." but then follow up with 'If they do" ? is this your expert answer? or did you even test out your answer before posting it? I have tested them out and have had great results in chasing away critters as soon as they are plugged in! Now to answer your question about how they work, it is an ultrasonic frequency that is emitted that rodents do not like, much like a dog whistle. keep it plugged in and no rodents, unplug them and no more dog whistle to keep them away! simple as that!

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Wiki User

13y ago

What else can I help you with?