The world’s first life-saving whistle developed in 1949 and still going strong. Dual frequency designed to stand out from background noise. As a pealess whistle with no moving parts, the 649 Survival whistle will still work when wet and in freezing conditions, unlike whistles that contain peas. Perfect for use in harsh environments such as marine, aquatic and cold environments. SOLAS and NATO approved. Rescue orange so you won’t lose it. Remember: Three blasts of the whistle, with a minute’s gap between each set, will let people know you need help.