The Original HyperWhistle Worlds loudest whistle up to 142db Loud， Very long range， For Referee， Coaches， Instructors， Sports， Teachers， Life Guard， Protection， Self Defense， Survival， Emergency uses<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> LOUD! - Up to 142dB for 2+ mile range </span></li><li><span class="a-list-item"> Lightweight Design with Omni Directional Output </span></li><li><span class="a-list-item"> Used for Boating， Sporting Events， Life Safety </span></li><li><span class="a-list-item"> Works in all weather environments， including underwater </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41UnNZcJXOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51JIn76p-uL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41h4g%2BebhGL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/514SAULFAgL.jpg" noproxy>