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Unique patented design allows it to be heard under water, up to 50 feet. The sounding chamber forces all water to be purged when the whistle is blown. It is perfect for divers, lifeguards, and for recreation. The whistle is great for all outdoor activities, and has a fire starter as well as a thermometer. It also creates a clear, high frequency sound, with a power rating over 75% greater than other referee and safety whistles.
Works in, on and under water