No inhumane shock collars or other painful methods! The Bark Stopper emits a harmless, high-pitched pulse that is inaudible to human ears, but extremely irritating to dogs. The dog soon learns to avoid the unwanted behavior! Train your own dog or even your neighbor's. Features two sensitivity levels. Comes with a stand for easy portability – or slides into the wall bracket. Easy to remove from the bracket when you want to use it somewhere else. Comes in a convenient 2-pack! That means you get one extra Bark Stopper free and pay one low price for both! Works up to 20 feet away! One 9V battery needed (not included). Water-resistant. Approx. 4-3/4" high. Order today, directly from us!