• This Soundless Training Whistle is made from a robust, nickel-plated brass in a high-gloss finish
• While it is barely audible to humans, dogs are able to detect the whistle up to a 400m range
• You can maintain a constant pitch by locking the secure nut on the adjustment screw

Specifications: Brass Polished;Nickel Plated; Blue; Includes a Plastic Cover & Sleeve