Ultrasonic dog repeller works, does it hurt people?

Ultrasonic dog repeller works, the human hearing range is 16-20000Hz, while the dog’s hearing range is 15-50000Hz. ultrasonic dog repeller is the use of the human ear inaudible 25000Hz, issued an instant strong “explosive” sound to stimulate the dog’s hearing and nervous system, so that the dog feel scared. 25000Hz sound, inaudible to the human ear, will not produce any distress and stimulation; the dog can hear, and can produce effective stimulation of the dog, the instantaneous ultrasound will not bring any harm to the dog.