<p>We want to keep your pet safe by providing you with the tools and techniques to successfully train your pet. How Outdoor Bark Control Works When Outdoor Bark Control is within range of a barking dog, an internal microphone picks up the sound and the device is automatically activated. The outdoor bark control emits an ultrasonic sound. The ultrasonic sound can be heard by dogs but it is silent to humans. When the dog stops barking the ultrasonic, the dog should stop barking, because he will associate his barking with this unpleasant noise. the sound also stops. Outdoor Bark Control has 3 range levels and a test mode. It is effective up to 50 feet. Features: 1. uses ultrasonic sound to deter unwanted barking 2. Detects barking up to 50 feet away using an internal microphone 3. levels of operation, including a test mode 4.Chargable, durable and weatherproof for outdoor use Possible uses for outdoor bark control - Stop your dog from barking 5. Stop your dog from barking 6. Train puppies not to bark 7. deter dogs from barking on camping trips Caution: 1.Humans cannot hear ultrasonic sound, but care should be taken when preparing for bark control exterior for use. 2. Keep an arm's length away from the human ear to avoid hearing damage if a dog starts barking while you install, mount or hang the Outdoor Bark Control. 3.Humans should also avoid keep very close to the exterior bark control when turned on. 4.Not for use by children. NOTE: This device is intended for use with dogs only. Never attempt to use it for purposes not described in this manual. Keep it out of the reach of children.</p>