Product OverviewSlim, super bright and easy to use, E50 is truly a powerhouse in your hand. Powered by two 18650 batteries or four CR123A cells, E50 delivers a 780-lumen neutral white beam and runs for 80 hours in low mode. With the adjustable battery tube and four brightness levels, you can easily customize the size, output and runtime of the flashlight to best suit your adventure.SpecificationLED Type Cree XM-L T6Max Output 780 LumensMax Runtime 80 HoursAdjust Level 4Switch Type Dual switch system Battery CR123A or 18650Operation Mode GeneralDimensions 8.14"(L) x 1.57"(D)Weight ( oz) 5.17AccessoriesLanyardSpare O-RingsRubber Switch Boot.