DESC: A must have for the back country, the Storm Safety Whistle’s patent pending harmonic chamber makes it the loudest whistle on earth. Produces a decibel reading between 118 and 120 dB, more than twice as loud as any other whistle tested. Easily heard over cheering crowds, waves and wind. Even works under water – used by dive clubs to organize multi-diver events and to signal a buddy while underwater, and trusted by crews of Navy Rescue boats. An essential component of your disaster preparedness kit for your car. Plastic construction. Orange. 3" x 1 34". Made in USA.