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Deluxe Dual Tone Marine Whistle with Lanyard "Orange"Signal the boat or other divers on the surface. Attaches easily to your BC, just loop the Nylon line through a D-Ring, Grommet or around the inflator hose. Includes a round barrel lock for added security.Dual tone gives a louder pitch for your dive boat or buddy to hear you! Our Rescue Whistle is a valuable safety accessory that no diver should dive without!