The NWS10 Titanium Outdoor Emergency Whistle from Nitecore is a light, compact, and powerful single-chamber whistle with a maximum intensity of 120dB. It is ideally suited for emergencies, law-enforcement, security, or outdoor spectator events. Its temperature and corrosion-resistant TC4 titanium alloy body is made from a single block making it durable and strong. Titanium is also hypoallergenic and non-toxic, so it is safe for anyone to use. A Teflon resonator is also temperature and corrosion resistant. The whistle will work in wet or dry conditions, as well as extreme hot and cold temperatures.