All-Weather Storm Whistle
This storm whistle is loud! When you’re lost and trying to get rescuers’ attention, a blast from a whistle will carry much father than simply yelling, not to mention it takes significantly less effort to blow a whistle. This whistle is waterproof and bright orange and is a perfect tool to help you get rescued.
From the manufacturers website:
The Storm All-Weather Safety Whistle is the loudest whistle on the market. Its unique patented design allows it to be heard under water, up to 50 feet, because the sounding chamber forces all water to be purged when the whistle is blown. Made in the USA. It’s perfect for divers, lifeguards, and for recreation! Creates a clear, high frequency sound, with a power rating over 75% greater than other referee and safety whistles.