One of the lightest, brightest, and most comfortable headlamps available today, the Enduro features high and low settings and a runtime of up to 24 hours. Green ultra-bright LED bulb delivers up to 8 lumens of lighting power. Solid state power regulator provides maximum light output throughout battery life. Impact-resistant, O-ring sealed construction resists water up to 1 meter for 1 hour. Includes 1 rubber/elastic combo head strap. Powered by two 1.5V AAA cells (included). Lighting output: 8 lumens, 162 candela (high setting); 4 lumens (low setting). Runtime: 9 hrs. (high setting), 120 hrs. (low setting). Maximum headlight dimensions: 2.25"W x 1.6"D with head strap and mounting strap. Facecap diameter: 1.3". Weight: 2.75 oz. with battery and head strap.