The windstorm whistle out performs other whistles in loudness, in all weather conditions and safety situation On land it can be heard up to 15 miles and can even be heard under water, up to 50 feet. Can be heard through walls, through glass and through Water A high impact non corroding thermoplastic protective housing is easy to grasp the double chamber design allows it to be blown when held right side up or upside down forcing, all water to be purged when the whistle is blown.