Now you can train your dog to stop barking with the sonic Bark Stopper. When your dog barks, it will emit a harmless, high-pitched pulse that is annoying to dogs, but inaudible to humans. Your dog will soon learn to be quiet. Portable and water-resistant, it features two sensitivity levels and is effective up to 20-feet away. Stands on a table or mounts on a wall (hardware included). Requires one 9-volt battery (not included). 5"H x 1 1/4"W x 1 3/4"L.