Virtually indestructible LED emitter regulated to maximize light output and runtimeTwo output levels - high of 600 lumens for maximum light and low of 15 lumens for extended runtimeDual-output tailcap click switch--press for momentary-on low click for constant-on low return to off then press or click again for highPrecision micro-textured reflector creates smooth optimized beamTough Nitrolon body anodized aluminum bezel