PSI's Silent Dog Training Whistle creates a pitch your dog can hear but your neighbors can't! This high-quality whistle features an adjustable pitch that is perfect for training your pet.
Since dogs can hear sounds that are inaudible to the human ear, this whistle is a perfect way to call them once they're trained to respond to a specific pitch, which you can maintain by using the locking nut that can be screwed down to ensure the same pitch is reproduced each time. Although this whistle is almost fully inaudible to everyone but your dog, please note that it is not completely silent to the trainer. This great training tool is 3-1/4 inch long with a small ring to attach to a key chain for easy travel.