Effective Bark Control: Our Ultrasonic Bark Control Device is a smart and effective tool for training dogs to reduce barking. Utilizing ultrasonic technology, it helps create a peaceful environment by discouraging excessive barking. Intelligent and Safe: Designed with intelligence and safety in mind, this device emits ultrasonic sound waves that are audible to dogs but not to humans. It provides a humane and non-intrusive approach to discourage unwanted barking behavior. This anti-bark device utilizes ultrasonic technology and is suitable for all breeds and sizes of dogs. The bark control automatically emits a high pitched tone that only the dog can hear. It automatically senses the sound of the dog's voice and once the dog stops barking, the ultrasonic bark control automatically stops emitting the ultrasonic sound; Anti-barking device with 3 levels of adjustable sensitivity (effective range in at 4.5,9 to 15.24 meters) - High, Medium, Low, 15kHz-30kHz (High) for large and naughty dogs, 20kHz (Medium) for mild dogs, 30kHz (Low) for small dogs; USB rechargeable battery, 5 hours charging can be used for 30 days (recommended to be fully charged before use, the effect will be better); IPX4 level waterproof and rainproof, indoor and outdoor can be applied. Can be hung on a tree, wall or fence post, even in windy and rainy days, the package includes 2 mounting screws and bracket. Size:8.5*4.8*11cm.