Fox 40 Sonik Blast whistles are extremely easy to blow. Advanced science and technology makes this the most efficient, loudest whistle ever produced by Fox 40. This whistle cannot be overblown and emits sound power that exceeds 120 decibels. This clear loud blast carries above the loudest crowds and noise, and over extreme long distances. Ideal for large crowd arenas, airport runways, search and rescue, outdoor activities and any situation where a loud signalling device is needed. Includes a break away lanyard