Range up to 50 Feet Anti Bark DogThe sonic penetration range is 50 feet, covering indoor and outdoor area. Compared to 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 at 100%. less than 50 feet. The smaller the range, the better the effect.<br> Dog Ultrasound Effective on Most DogsThe anti bark dog box works on most breeds and sizes, but not on deaf or hard of hearing dogs. Some dogs may be afraid or not like the sound of ultrasound, they will not stop barking at first. Please allow until 2 weeks for training.<br> Safe and Effective Ultrasonic Anti BarkingSonic is harmless to pets. If the dog is hard of hearing or aggressive, the dog bark control may not work as intended. The use of a dog ultrasound unit against two or more dogs barking at the same time is not recommended.<br> Easy and waterproof Anti Bark InstallationThe anti bark device is designed to be easily hung on the wall. or mounted on a tree, wall or fence post to prevent your own dog or that of your neighbors from barking. Make sure the ultrasonic dog anti-bark device is facing the dog away. free range.<br> Rechargeable and Durable Anti Bark CaseBuilt-in 1500 mAH lithium battery can work continuously for 30 days after 5 hours fully charged. The low battery indication ensures that it charges within 24 hours. time. The rugged IPX4 ABS waterproof housing provides maximum protection. The exterior ultrasonic anti bark dog has a longer lifespan and can be placed in a car. or hung anywhere à inside and outside the exterior.