We have a barker and decided to get one of those collars (after much deliberation). We kept it on the lowest setting and that poor dog barked herself into a frenzy when the collar went off. NOT the desired effect. She got to the point to where she peed herself when she only saw it so we got rid of it. Her barking is being managed with patience, consistency, and the occasional water spray. I would not get one of those collars - ever again!