Improve the efficiency of dog training-Ultrasonic Bark Preventer combines dog training and barking control functions. Ultrasonic anti-bark device can effectively train your dog to stop bad behavior, stop barking device, anti-bark device, bark control device, and stop dog barking device Ultrasonic Bark Control Device Bark Stop Ultrasonic Outdoor. Stop dog bark Bark control Provide 100% safety for you and your dog-the average human hearing frequency range is 20HZ~20KHZ, and the dog can hear the range from 15HZ to 120KHZ. Our ultrasonic bark controller emits ultrasonic waves at a frequency of 25KHZ, so the sound will not affect anyone. Contain sensitive microphone isolates and picks up barking up to 50 feet away to stop barking both outdoors and indoors (recommended starting mode for indoors is level 1, increase if needed). NOTE: Does not work on deaf or hearing impaired dogs. [Latest upgrade]: A device to stop barking dogs. Like an alarm clock, the dog barking control device is compact, easy to place and hide. Can test two LED battery status indicators, three adjustable ultrasonic volume levels-low range, medium range and high range. [Protection, effective]: Designed to be easy to hang or install on a tree, wall or fence to prevent one's own dog or neighbor's dog from barking, anti barking device, dog trainer, anti-theft device.