🐾🐾Harmony Between Humans and Dogs Starts Here! Use dog barking control devices to train your dog to stop unwanted behaviors: barking, stealing food, jumping up, biting, dog attacks, chewing and avoiding furniture. ⏩How the Barking Dog Silencer Works?⏪ 1. When the outdoor bark control is within range of a barking dog, a microphone pick up the sound and the unit is automatically activated. 2. The outdoor no bark control emits an ultrasonic sound. (ultrasonic sound can be heard by dogs, but is silent to humans). 3. Startled by the high-pitched sound, the dog should stop barking, it will associate its bark with this unpleasant noise. 4.The Bark Control has 3 range levels and a test mode.It is effective up to 50 feet. 5. When the dog stops barking, the ultrasonic sound also stops. Specification: Size: 6.77 x 5.39 x 5.31 inches Weight: 0.73lb Power: 1 x 9V battery (not included) Modes: T Verify the microphone and speaker are functional 1 Low Range(Up to 15 feet) 2 Medium Range(Up to 30 feet) 3 High Range(Up to 50 feet) What’s in the box? ☑1*Anti Barking Device ☑1*Manual 🎇Note: 1. When using anti barking device for dogs indoor and outdoor, there should be no barrier or large cover between the dog and the bark control. 2. At first the dog may not like the sound or get used to it and will keep yelling, so please give them two weeks to get used to it. 3. Change the location and frequency of the dog barking deterrent device occasionally to prevent the dog from adapting. 4. If a dog is deaf or hearing impaired, he may not respond to the dog barking stopper ultrasonic. 5. Humans cannot hear the ultrasonic sound, however, although ultrasonic waves are inaudible to humans, but some people experience discomfort after activating the device for a long time in a small indoor space.