Here's a testing of the Sharx Fox 40. I attended my nephews high school graduation in a gymnasium was filled with about 4,000 people. At the end, the crowd cheered so loudly that it felt right to cover your ears. At that moment, I pulled out my Sharx Fox 40 and blew it. The sound of the whistle was easily identifiable through all the noise. My nephew, who was about 200 feet away said afterward that he easily heard the whistle, and he wasn't particularly trying to hear it. By the way, using a whistle in a noisy crowd is foreseeable for survival purposes (signal a friend, prevent a crime, etc.).

Side note, I have seen many NBA referees use the traditional Fox 40 whistle (not the Sharx). Those whistles cut through the noise of the cheering crowd to be heard easily by the players. You can also hear the sound of those whistles coming through the television if you're watching at home. Well, the Sharx specifications indicate it's louder than those traditional Fox 40. If you used a Sharx to cheer at an NBA game, security would probably escort you out of the arena if you manage to stop the game. In fact, I've seen that happen to somebody who thought it would be funny. Jokes on him...LOL