Not a peep
I have two mastiffs, and was advised to get the SportDog static collar.
The larger of the two I started on 1, moved to 2, and he hasn't barked since.
The smaller (female), is a little more determined/territorial, and we finally settled on 5.
Worked so well that I don't need them to wear every day now.
Great deterrent and my neighbours like me again. Thanks!