Developed for the U.S. Navy to locate overboard persons, this compact survival whistle issues a shrill, 102 decibel dual tone that is audible over great distances. The unique, flat design keeps it from holding water, and the 18-inch (46 cm) lanyard attaches to the life jackets, rafts and foul weather gear. • Gets attention! • Loud, shrill, dual tone audible from great distance • Unique flat design prevents holding water • Required by SOLAS 83 • Meets USCG/SOLAS requirements • Aids in land or sea rescues • Use on life jackets, vests, foul weather gear, ring buoys, rafts, keychains, etc • Developed for the U.S. Navy; used by NASA, major airlines and shipping companies • Complete with 18-inch (45.5 cm) lanyard Size : 1 x 2 x .25” (2.5 x 5 x 6 cm) Weight : 1.4 oz (40 g)