How To Test Dog Bark Deterrent Devices1. Adjust the knob to "1" button. 2. Place the item to a position which is one arm's length away from you. 3. Whistle to the microphone of the item loudly, if the LED blinks Green, and you can hear beeping noise, then the item work properly. How the Barking Dog Silencer Works1. 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. When the dog stops barking, the ultrasonic sound also stops. DIRECTIONS 1

Quiet OperationIt only works when the dog is barking, which can provide a quiet sleeping environment for your family and neighbors the ultrasonic wave of the anti-bark device harmless to pets, completely inaudible to human ears. When the bark stopper handles the dog's barking, it can be assisted by training to gradually reduce the barking. Anti Barking Device for DogsThe ultrasonic frequency emitted by the ultrasonic barking controller is within the average hearing range of dogs. Other family members or neighbors will not worry about being affected. It will not cause major punishment to the dog and it will emit ultrasonic that only the dog can hear to get its attention. Durable Barking BoxIt is designed to be easy to hang installed on trees, walls or fence post to stop any dog barking (within range), indoor, outdoor and anywhere else. The dog deterrent device is not suitable for aggressive dogs and hearing impaired dogs. Easy to UseAnti barking device has a built-in pickup that can detect the dog's barking within 10 m and automatically emits ultrasonic that the dog can hear. Once the dog stops barking, the device automatically stops. Compared with the traditional dog training device, it completely frees your hands. Automatic and effective training your dog to stop excessive and noisy barking. 3 Adjustable ModesDog Barking Deterrent Device has 3 adjustable levels (1m-10m). Different dogs may be sensitive to ultrasound in different frequency bands. Please turn the knob to test different frequency bands for best results. If you or your neighbor's dog barks too excitedly, put it in the right spot, and you'll have a quiet resting environment.