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Title: Does not work at all.
Review: I tried this device on a couple of small dogs that bark incessantly in my neighborhood. I walked up within 3 feet of them, pointed the device directly at them, pressed the button firmly for 20 seconds and it had absolutely no effect whatsoever. As a matter of fact, I think they even increased their barking frequency. Maybe this works for others, but a waste of money for me.
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