I have 3 dogs, I bought this to help train my stubborn 11-month-old Great Pyrenees puppy. The other 2 dogs are already trained Terriers. As far as I can tell this is an expensive fancy light, period! I have used this for over a week now. The red beam grabbed all 3 dogs' attention at first, now they completely ignore the device. There isn't any stopping or even hesitation in any of the animals, There isn't any indication of any sound being emitted i.e. turning head, ears changing position, any body language to even hint at a sound being emitted and certainly not stopping or even any hesitation when the device is being activated. Don't waste your money on this device, kinda expensive for a flashlight! I will send a clip of the purchase verification in the next e-mail as I do not have an order number.
Bottom Line: No, I would not recommend this to a friend
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