The bark control unit automatically emits high tones that only dogs can hear. As soon as the dog stops barking, the ultrasonic bark control automatically stops sending ultrasonic noises. Ultrasonic anti-bark devices automatically detect barking up to 50 feet away. Suitable for most breeds and sizes of dogs, except dogs with hearing problems or under six months old. The dog bark controller can effectively train your dog to stop barking. unwanted barking and to be obedient to develop good behavior. Water resistance: IP45; For easy hanging/mounting on a tree, wall or fence post to stop your own dog or your neighbor's dog from barking; Ultrasonic frequency is not harmful to pets and animals. human ears, but some dogs may be afraid or dislike the sound. Don't stop barking at first. Therefore, wait up to 2 weeks for formation.2023 NEW