I bought two of these hoping it would be the magic trick to help with training our dog. It has not been even the first bit of help. I can only assume it's working as supposedly humans can't hear it. I wish there was something I could hear to know it's working. The light works but that's all I can tell and it's NO help. I feel I just threw $50 down the drain!
Bottom Line: No, I would not recommend this to a friend
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