How it works: This product uses ultrasonic anti-bark technology. The product will automatically emit ultrasonic waves after detecting the dog's barking. This sound can only be heard by dogs, not humans. The dog will be frightened by the sudden high-frequency sound and will normally stop barking. He will associate barking with the uncomfortable sound. This method is safe and effective. After a few repetitions, the dog notices that the barking is causing him discomfort and gradually reduces the barking. quick to use 1. Install a 9V alkaline battery (not included). 2. Press the "ON/OFF" button for 1-2 seconds, the screen will turn on. 3. Simulate a dog barking, the screen will flash 3 times, which means the product is working normally. 4. Place the product on a table or hang it on the wall (choose a place where only the dog's barking can trigger the product). Selection of the ultrasonic frequency point The frequency of the ultrasonic wave emitted by the standard version is fixed, and the intelligent version can choose 10 different ultrasonic frequency points or use the automatic frequency conversion function. Press the "point selection key " to cycle through 10 different frequency points. Please test your dog's response to ultrasound at different frequencies and select the frequency with the greatest response. You can also select "Auto" mode, and the device will randomly select a frequency point every time it emits ultrasound. Detection range up to 15M: The ultrasonic penetration range is 50 feet and covers the area indoors and outdoors. Compared to traditional dog training device, hands are completely free. After testing, the best effect is within 10M. The smaller the range, the better the effect. With LCD display: 3 different levels can be adjusted using the anti-bark device buttons. Compared to other similar products, the frequency and battery level are easier to see. Different dogs may be sensitive to ultrasound in different frequency bands. So we recommend maintaining the level for more than 2 weeks. Easy to install and waterproofHang or mount our ultrasonic dog bark control device on a tree, wall or fence post to prevent your own dog or that of your neighbors from barking. Make sure the ultrasonic bark is aimed at the dog within unobstructed range. Safe and HumaneThis dog bark deterrent has been tested and found to be completely harmless to pets of all sizes. sizes. It certainly won't harm anyone. Design with durable waterproof and high quality material. You can use this anti-bark device as a bark control both outdoors and indoors. Both are perfectly safe. Delivered quantity: 1 piece