The Storm Whistle is a great and useful accessory for divers and rescue teams alike! It comes with the ability to produce a loud sound which draws significant attention from as far as 0.5 miles away. Designed to enable a unique sound to be heard underwater from up to a depth of 50 ft., the product could literally prove to be a life-saver! With a rating of 120 dB, it is about 75% more powerful than other safety whistles on the market. A patent-pending harmonic chamber makes sure that water does not enter the space that produces the signal-noise, enhancing this whistle's durability. You can find the product in multiple attractive colors so that you can spot it quickly for use in an emergency situation. The Storm Whistle is the ideal choice for protection on the high seas!