The Train Right!® Deluxe Silent Dog Whistle with chain features an adjustable tone that carries a long distance. This silent whistle is inaudible to you, but your dog will hear it and respond. It is audible up to 900 feet away. Use this silent whistle to call your dog back to you during outdoor activities. Features: *Silently communicate with your dog when out and about. *Adjustable tone can be used to train for various tasks. *Frequency can travel 900 feet. *Includes cap and chain lanyard so you can carry it easily. *Complete with pea component so the whistle can be trilled for different sound combinations. Applications For calling your dog during outdoor activities.