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 Three modes and strobe, lumenoutput, run time, and beam distance dependent upon mode selected. Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination Optimized electronics provides regulated intensity C4 LED Technology; Shock-proof with a 50,000 hr. lifetime Unbreakable polycarbonate lens with scratch-resistant coating,O-ring sealed 3-cell, 3.6 Volt Ni-Cd sub-C battery, rechargeable up to 1000 times Fits existing Stinger snap-in chargers