[ DOG TRAINING & BARK CONTROL ] : The anti barking device uses the ultrasonic technology which is suitable for dogs of all breeds and all sizes. Stop excessive, noisy dog barking by emitting an ultrasonic sound to silence the dog. The anti barking device with 4 adjustable ultrasonic volume levels? Low, Medium, High. Please turn the knob to test different frequency bands to obtain the best results. [ SAFE FOR DOGS & HUMAN ]: One of the most safe and widely used way to keep your own dog or your neighbors dog from barking. The ultrasound will not cause interference or harm to human or Dog, because human hear these frequency bands, but some dogs may be afraid or dislike this sound, the adaptability of each dog is different. The barking will not stop at first, so please allow up to 2 weeks for training. [ WEATHER-PROOF ]: Our anti barking device is weatherproof, it can withstand any weather conditions; making it an excellent outdoor bark control device. Operates with 9-Volt batteries (not included) and will last up to 1 months depending on use. [ EFFECTIVE & POWERFUL ]: This anti barking device comes with a well-designed cute shape. The range of ultrasonic penetration is 50ft, covering the area indoor and outdoor. Designed for easy hanging/mounting on a tree, wall or fence post to stop any dogs barking (within range). It has a range of 15, 30, and 50 feet respectively and automatically activate a dog barking control system.