Range up to 15 meters Anti-barking device: The sonic penetration range is 15 meters, both indoors and outdoors. Compared with traditional dog training equipment, your hands are completely free. By rotating the button, you can easily train the dog's behavior. After testing, the best effect is within a radius of 15 meters. The smaller the range, the better the effect. Effective for most dogs: The device works for most breeds and sizes, but not for deaf or hard of hearing dogs. Some dogs may be afraid or dislike the sound of ultrasound, which is why they will not stop barking at first. Consider a training time of up to 2 weeks. Safe Barking Stopper: Sonic is harmless to pets. If the dog is hard of hearing or aggressive, the device may not work as expected. Using one device against two or more barking dogs is not recommended. Easy Installation & Waterproof: The device is designed to be easily hung or mounted on a tree, wall or fence post to prevent your dog or your neighbor's dog from