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Title: Useless....
Review: I am a letter carrier, and this product is junk. I think dogs can hear something when activated. I say that because when used on a docile dog, you might see a slight reaction from the dog. Nothing spectacular though... ears perk up, or head turns slightly. It is obviously only a mild sensation.If you plan to use this to ward off agitated dogs all I can say is be prepared to throw this at the dog, because the noise it makes does NOTHING to fend off an excited dog. You would get more of a reaction by yelling loudly, or shaking a tin can full of nails. Don't waste your time or money on this junk. there may be a product of this type that works, but this is useless!
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