【Range up to 50 feet Anti-bark device】The sonic penetration range is 50 feet, covering the indoor and outdoor area. Compared with the traditional dog training device, it completely frees your hands. You can easily train the dog's behavior by rotating the button. After testing, the best effect is within 50 feet. The smaller the range, the better the effect. 【Effective on most dogs】 The device works on most breeds and sizes, but not on deaf or hard of hearing dogs. Some dogs may be afraid or dislike the sound of the ultrasound, they will not stop barking at first. Please allow up to 2 weeks for training. 【Safe Barking Stopper】Sonic is harmless to pets. If the dog is hard of hearing or aggressive, the device may not work as intended. Using one device against two or more barking dogs at the same time is not recommended. 【Easy and waterproof installation】 The device is designed to be easily hung or mounted on a tree, wall or fence post to prevent your own or your neighbors' dogs from