①. Anti-Bark Device with up to 50ft Range: The sonic penetration range is 50ft, covering indoor and outdoor areas. Compared with traditional dog training devices, it allows for hands-free operation. You can train the dog's behavior by turning the knob. Testing shows that the effect is observed within 50 feet, and a smaller range may lead to a relatively better effect. ②. 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 and may not stop barking initially. It is recommended to allow up to 2 weeks for training. ③. Safe Barking Stopper: The 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. ④. Easy Installation and Waterproof: The device is designed to be easily hung or mounted on a tree, a wall, or a fence post to help address barking from your own dog or that of your neighbors. Make sure the bark controller faces the dog in free range. ⑤. Rechargeable and Durable: Built-in 1500mAH lithium battery can work continuously for 30 days after 5 hours of full charge. Low battery indication helps ensure timely charging. The sturdy IPX4 ABS waterproof case contributes to a longer lifespan, allowing the device to be placed or hung indoors and outdoors.