💒【Safe & Friendly Barking Dog Deterrent】 Dog barking deterrent device does not cause any disturbance or harm to the human body. The ultrasonic waves emitted by the dog barking control device are specially tailored for dogs and emit ultrasonic frequencies that are within the average hearing range of dogs. Only the dog can hear. Tell him to stop barking. Your dog's health is our top priority and our equipment ensures humane training methods. 🐾【4 Modes of Dog Deterrent Devices】This dog barking stopper ultrasonic 3 range levels and 1 test mode-high, medium and low, dog barking silencer can detect barking within 15, 30, and 50 feet. When activated, the barking control can automatically activate the barking control device, which emits ultrasonic waves, effectively preventing indoor and outdoor barking. You can turn the knob to test different patterns for best results. 🐩【Automatic anti-barking devices】Our dog bark deterrent devices are used to prevent excessive barking. Using the latest ultrasonic technology, the anti barking device for dogs only works when it senses a dog barking. Once the dog stops barking, the dog barking deterrent device automatically stops. Barking deterrents can effectively train your dog to stop excessive and noisy barking and give you a quiet life!