(Range up to 50 feet Anti-barking Device) The sonic penetration range is 50 feet, covering 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 turning the knob. 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 ultrasonic sound, 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 expected. Using one device against two or more barking dogs at the same time 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 own or your neighbor's dog from barking. Make sure the bark controller faces the dog within clear range. (Rechargeable & Durable) The built-in 1500mAH lithium battery can work continuously for 30 days after 5 hours of full charge. The low battery indication ensures that it charges in time. The robust IPX4 ABS waterproof case gives the device a longer service life and can be placed or hung anywhere indoors and outdoors.