Black Storm US Navy Seals All-Weather Safety Whistle - Navy Seals& Coast Guard Approved. Official USN Whistle. The Storm All-WeatherSafety Whistleis the loudest whistle in the world. Period. Its unique patented designallows it to be heard under water, up to 50 feet. The Storm Whistlecreates a clear, high frequency sound, with a power rating over 75%greater than other referee and safety whistles. The Storm Whistle isrelied upon by the U.S. Armed Forces, various U.S. Military, Police,Firefighters, Campers, Hunters, Sporting Events, Campers, Hikers,Hunters, Scuba Divers, Police & Firefighters. Adopted by US Military& US Navy Seals (The US Military Team that captured Osama BinLaden). When being heard is a matter of life or death. For PersonalProtection. EXTREMELY LOUD. Keep out of the reach of children. Made in the USA. GSA Compliant.California Proposition 65 WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects and other reproductive harm.