Effective control of dog barking: - Newly upgraded chip that stops excessive and loud dog barking by playing an ultrasonic sound to silence the dog. More effective than the old deterrent and waterproof versions. . 4 Adjustable sensitivity: - The anti-bark device has 3 range levels and a test mode. Including: low sensitivity (15 feet), medium sensitivity (30 feet), high sensitivity (50 feet). you can use test mode to check if the microphone and ser are working properly. . 100% harmless: - It puts out high frequency ultrasound to make the dog uncomfortable and stop barking instead of hurting it, no effect on the dog's health. And is completely inaudible to humans, so it is absolutely safe. . Waterproof and durable: - The barking device designed for outdoor use is made of high quality waterproof material. Whether it's a sunny day or a rainy day, just turn on the switch and you won't have to bark. On the other hand, it will also be a good helper to train your dog. . Effective for most dogs: - Suitable for dogs of all breeds and sizes, but not hard of hearing or hard of hearing dogs. Open the bark control only during unnecessary barking to prevent the dog from becoming unresponsive. Powered by 9V battery operation (NOT INCLUDED). .