The BarkStopper is a high quality dog trainer device that gets a dogs attention at a push of a button by transmitting ultrasonic sound waves. These waves can be heard by a dog up to 50 feet away yet are inaudible to humans. The ultrasonic waves can travel easily over fences, walls and hedges and are ideal for dog training purposes or for stopping your neighbour’s dog from barking. The clever device also features a loud audible sound button which can be used if the dog is out of range. All orders come in a BarkStopper box and with simple to understand instructions. The BarkStopper is powered by 2 x AA batteries which are not included.