The same recognizable whistle used by sports referees worldwide, the Fox 40 is the loudest rescue whistle available. Specified by the DOD, and found in U.S. military survival kits. The signal easily attains 115 decibels, produced by 3 tuned air chambers that produce slightly different frequencies. This causes a complex sound phenomenon called a "beat" or "trill" giving the human listener more auditory cue to perceive and locate the source of the whistle in a rescue situation. The pealess air chambers clear instantly of water or saliva when blown, so it can be used even when submerged. We recommend earplugs when testing. Comes in many colors, let us pick for you!
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