One of the lightest, brightest, most comfortable head-lamps available today. Features High and Low lighting modes and a runtime up to 24 hours. *powered by two 1.5V AAA cells (included) *.5 watt high-flux, 100,000 hour life LED *Up to 14.5 lumens typical and up to 850 peak beam candlepower (high mode); 6 lumens typical (low mode) *Solid State Power Regulator provides maximum light output throughout battery life *Up to 6 hrs, runtime on high mode; up to 24 hrs, on low mode *Impact-resistant, drop-tested housing *O-Ring sealed construction *Waterproof to 1 meter for 1 hr. *Facecap diameter: 1.3 in *Max. headlight with: 2.25 in *Max. headlight depth: 1.6 in including head strap and mounting strap *2.75oz with battery and head strap *Includes rubber/elastic combo head strap