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Title: Somewhat works
Review: This seems to somewhat work on some dogs. Some dogs (perhaps older ones) don't seem to hear it or be bothered by it. Some dogs do seem to hear it and are repelled slightly. I haven't found any dog that is "significantly" repelled by it. I can say though, that I certainly can't hear anything myself (neither can my wife or child) except the button click when it is activated and de-activated.
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