Brilliant white light from high-output lamp (included) or ultra high-output lamp (optional) * Precision micro-textured reflector creates smooth, optimized beam * Coated tempered window resists impact, maximizes light * Tactical tailcap switch-press for momentary-on, twist for constant-on * Includes 2 high-energy 123A batteries with 10-year shelf life + 4 extra Batteries For a Total of 6 Batteries