Is barking driving you crazy? Now you can reduce your dog"s barking safely and humanely with this revolutionary training aid. Simply place Bark Stopper in the area where your dog usually barks and turn it on. Bark Stopper - is automatically activated when your dog barks. It emits a safe, high-pitched sound that only your dog can hear and safely trains your dog to stop barking. Bark Stopper has a 20 foot range and comes complete with a wall mount. Bark Stopper has two sensitivity levels; low and high that allow you to customize to your dog"s needs. Bark Stopper uses a 9 volt battery (not included). Bark Stopper is completely portable so it goes where your dog goes and it is great for both indoor and outdoor use. The Bark Stopper "s compact sleek design is perfect for carrying in your purse, jogging pack, pocket or in the car.