US Navy Storm All Weather Whistle is safety whistle. Worlds loudest whistle. Works in, on and under water. Navy Seals and Coast Guard approved. For personal protection. When being heard is a matter of life or death. North American fishing club - seal of approval. Great for sporting events, campers, hikers, hunters, scuba divers, police and firefighters, adopted by US Military. Made in USA. Storm whistles. US Navy storm all weather safety whistle.