Dogs Barking

We have a number of big dogs in our neighborhood. Once one starts barking, they all seem to join in together. I got a couple of things that are supposed to give out a high pitched noise when they bark. Once they realize that their barking is the cause of the painful high pitched noise in their ears, they are supposed to stop barking. We have only had them about a week but at times it really seems to be working. I am just not sure yet. I do hope it slows down the barking, especially at night so it doesn't interrupt our sleep so much.