Multi-function On/Off push-button switch lets you choose three lighting modes and strobe Three modes and strobe: - High for a super-bright beam - 640 lumens; 22,000 candela peak beam intensity; 297 meter beam distance; runs 1.25 hours - Medium for bright light and longer run times – 340 lumens; 11,000 candela peak beam intensity; 210 meter beam distance; runs 2 hours - Low for light without glare and extended run times – 170 lumens; 5,500 candela peak beam intensity; 148 meter beam distance; runs 4 hours - Strobe for disorienting or signaling your location; runs 3 hours Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination C4® LED technology, impervious to shock with a 50,000 hour lifetime