The link to Storm Wind Storm Safety Whistle has been copied
The world's loudest whistle can be heard clearly above noisy howling wind and virtually any competing sound as far as a mile away. Crowd noise or the roar of a loud engine will not overpower this safety whistle. Adopted by the US military, police, and security forces worldwide, the whistle features a patented resonance chamber that enables it to focus its sound like a laser beam and emit an incredibly loud noise. Ergonomic design fits comfortably in your hand. Whistle even works underwater. Great gift for boaters, campers, hikers, hunters, game officials, and more. 130 db.