London Metropolitan Police style whistle made of nickel-plated copper with anti-corrosion properties. For easy carrying and storage, the whistle uses an O-Ring that allows the whistle to be hooked up. Brand-new, Unused, Unopened Historically accurate reproduction this whistle has the original design of the WWI trench whistle. Also this model is carried by all London Metropolitan english Police, Scotland Yard and 80 other police departments world wide. The distinctive two chamber discordant sound whistle includes mounting ring to add to your favorite lanyard for easy access is ready to signal everyone in the area. This whistle can be inserted into keys and other items and can be used as a coach whistle, referee whistle, train your pet, outdoor sports whistle, survival ,emergency situations or call for help warning, traffic police command