The yc ultrasonic bark control is made of waterproof ABS, UV resistant. It works well indoor and outdoor. You can put it on the floor, hung on wall, doghouse, yard tree, and fence. The device uses physical methods to stimulate dogs but has no effect on dog health. Emitted ultrasound is completely inaudible to humans. It provides you and your family quiet surroundings when you are talking, sleeping, working, and coaxing the baby, etc. Our ultrasonic dog bark deterrent combines dog training and bark control. It can effectively train your dog to stop unwanted behaviors.