The Windstorm All-Weather Safety Whistle is one of the loudest whistles on the market. Its unique patented design allows it to be heard a half mile away over land and over a mile away over water - all because of its unique patented harmonic sounding chamber that focuses the sound like a laser beam. Made in the USA, the unique design allows the Windstorm Whistle to be easily blown with the slightest of breaths and held in a fisted hand like a roll of quarters. Lastly, the Windstorm Whistle is totally waterproof capable of working underwater. It's perfect for safety and survival, and is used by search and rescue teams, police, divers, lifeguards, and any situation where being heard is a matter of life or death! American made, the Windstorm Whistle creates a clear, powerful sound, with a power rating over 75% greater than any other whistle on the planet or in space. The Windstorm Whistle has been adopted by SpaceX, as part of their emergency kit.