I received this product at a discounted price in exchange for my unbiased review; I got this because my dog max barks at all times while outside and whines while inside so when I took this out of the packaged and easily adjusted the sound for him to respond and now the barking has almost stopped and the whining as well I think after a few more days of using it he will have completely stopped he doesn't like the sound at all but I'm thankful because now my household can sleep now I love this item and like I said there easy to adjust to the right whistle sound for your dog!
I have 3 small dogs that are all barkers
The sounds doesn't bother humans so it isn't a nuisance to my son or neighbors
This seems to be doing the job
My opinions are my own and I was not paid or compensated in any other ways
He advised that I do it until they get used to me or stop barking