【Ultrasonic Bark Control】The updated ultrasonic dog barking deterrent can intelligently capture the barking of the dog in the area covered by the system, and automatically emit ultrasonic waves to mute the dog. Once the dog stops barking, the ultrasonic sound also stops. Suitable for all breeds and sizes of dogs. It can be started with a 9V battery (not included). 【High-Quality Texture & 50FT range】Our dog barking control devices outdoor were conveniently designed with a mini alarm clock shape, IPX4 waterproof shell can effectively resist external water splash. But if it rains, it's best to take it back, which helps protect the equipment and extends its life. Built-in sensitive microphone picks up barking up to 50 feet away to stop barking both outdoors and indoors. Compared with the traditional dog training device, it completely frees hands. 【Convenient and Easy To Use】Hold it at arms’ length and whistle at the mic. The anti bark device will beep and the LED will flash green. The dog repellent is lightweight and compact, you can carry it in your pocket. 2 holes allow you to easy hanging/mount your anti barking device outdoor on a tree, fence, or indoors on the wall. Then select short, medium, or long-range and set the volume.