This device is a product designed to train dogs to keep away from undesirable behaviour. It does this by means of using ultrasonic waves. These produce sounds that aren't audible to the human ear, but are for the canine. As soon as he perceives the sound, it's miles ugly for him. This in turn signals to him that he's behaving in a manner that his owner does no longer like. However, via the innate "will to thrill" of every dog, the device is able to make the dog forestall the unwanted behaviour. It is really innocent for dog and owner, does no longer use any chemical materials, however in reality a valid that isn't even audible to human beings.