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 well-suited for emergencies, law enforcement, security, or outdoor spectator events. Its TC4 titanium alloy body is made from a single block which makes it durable and strong. Titanium is also hypoallergenic and nontoxic, so it is safe for anyone to use. The aluminum resonator is temperature and corrosion resistant. The whistle will work in wet or dry conditions, as well as in extreme hot and cold temperatures.