Range up to 50ft Anti-Bark DeviceThe sonic penetration range is 50ft, 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 scared or dislike the sound of ultrasound, they won't 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 and Waterproof The device is designed to be easily hung or mounted on a tree , a wall or a fence post to prevent your own dog or that of your neighbors from barking. Make sure the bark controller faces the dog in free range. Rechargeable and DurableBuilt-in 1500mAH lithium battery can work continuously for 30 days after 5 hours fully charged . Low battery indication ensures it charges in time. The sturdy IPX4 ABS waterproof case gives the device a longer lifespan and can be placed or hung anywhere indoors and outdoors.