Multi-function On/Off push-button switch lets you choose three lighting modes and strobe; designed for extremely long life; tested at 1 million actuations. Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination. C4® LED technology, impervious to shock with a 50,000 hour lifetime. Regulated run time provides consistent performance throughout battery life. Unbreakable polycarbonate lens with scratch-resistant coating.