Virtually indestructible LED emitter regulated to maximize light output and runtime Two output levels - high of 600 lumens for maximum light, and low of 15 lumens for extended runtime Dual-output tailcap click switch--press for momentary-on low, click for constant-on low, return to off then press or click again for high Precision micro-textured reflector creates smooth, optimized beam High-strength aerospace aluminum body, Mil-Spec hard-anodized for extreme durability