For dog training in the field. The Silent Dog Whistle offers adjustable pitch and long distance range. The pitch of the Silent Dog Whistle is barely audible to most humans, but is quite loud to your dog. The Silent whistle is perfect for field training because of the long distance range, and comes with a ring for easy attachment to a lanyard. Made of stainless steel with a plastic cover to protect it from dirt and damage. Features a locking nut and screw to lock-in the pitch when your dog responds.