Stop annoying barking from your dog - or your neighbor's dog - with Bark Stop Professional, a humane and effective bark deterrent that quiets noisy dogs. This revolutionary system automatically detects dog barking up to 35 feet and responds by emitting a high-pitched tone that humans can't hear. Although the tone does not cause pain to animals, most dogs don't like it and will stop needless barking. Bark Stop Professional uses an old age principle of "Negative Reinforcement" using sound to help train dogs to stop annoying barking. Works with any size or breed of dog. Use it to cure a dog's behavioral problems or to train puppies not to bark. Ideal for multiple-dog homes. Simply install the system using the included mounting bracket and point it directly at the barking dog's yard. Bark Stop Professional will automatically turn on when barking occurs. It also offers two tone settings, ultrasonic (only dogs can hear it) or audible (humans can hear it too) and audible test button. Waterproof. Great for indoor or outdoor use.