My 2 yo daughter did not have a problem with the Storm after I removed her finger from blocking the exit. She could not make a sound with any of my Fox40 (Classic, Sonik Blast, Sharx). She could make a sound with Acme 636. She could make a loud sound with Acme 560. She can make the Acme 660 go the loudest out of all the whistles I own. That little, boring-looking whistle is a powerhouse.