The%20Classic%20Fox%2040%20Safety%20Whistle%20is%20the%20original%20and%20still%20the%20standard%20choice%20for%20rescue%20professionals.%20Sometimes%20you%20have%20to%20be%20heard%20to%20be%20rescued.FeaturesThe%203-chamber%20pealess%20design%20has%20no%20moving%20parts%20to%20freeze%2C%20jam%20or%20deteriorate.Easy%20to%20blow%20and%20cannot%20be%20overblown.%20The%20harder%20you%20blow%2C%20the%20louder%20the%20sound.Chambers%20are%20designed%20to%20self-clear%20when%20submerged%20in%20water.Sound%20will%20be%20heard%20up%20to%20a%20mile%20away.A%20whistle%20is%20vital%20for%20signalling%20above%20the%20sound%20of%20surf%20and%20whitewater.Remember%2C%20in%20most%20on-the-water%20situations%20a%20sounding%20device%20like%20a%20whistle%20is%20required%20by%20the%20Coast%20Guard.We%20recommend%20against%20attaching%20the%20whistle%20to%20the%20zipper%20pull%20on%20your%20life%20jacket.%20That%20can%20result%20in%20accidental%20unzipping.SpecificationsDimensions%3A%202.25%26quot%3BL%20x%20.75%26quot%3BWIncludes%3A%20Split%20ring