4Sevens Quark 123 LED Flashlight - R5 Edition Power: One CR123A Battery (0.9V~4.2V) Output: Maximum - 170 lumens; Moonlight - 0.2 lumens Runtime: Maximum - 0.8 hours; Moonlight - 15 days Strobe: Strobe, S.O.S., and Beacon flash modes Length: 3.2 inches Diameter: 0.86 inches Weight: 1.4 ounces