There’s no other whistle like it anywhere. That’s why it’s trusted by military and police units, as well as search and rescue teams around the world. The Storm® Whistle is the loudest mouth-blown whistle ever made—up to twice as loud as a standard police or safety whistle. It produces a focused 3150Hz tone, a frequency chosen based on government research showing it cuts through background noise from wind, waves, engines, crowds, and even explosions. It’s completely waterproof and works in, on, and under water. (Because of its extremely high frequency, use with caution.)