Slim, super bright and easy to use, E50 is truly a powerhiuse 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 on low mode. With the adjustable battery tube and four brightness levels, you can easily customize the size, output and run-time of the flashlight to best suit your adventure.Automatically enters the previously used brightness level when turned onWaterproof to 2 meters for 30 minutesAbility to tail stand so can be used as a candleComfortable and secure gripPerfect balance of size and performanceLength: 207 mm; Diameter: 40mm146.6 gram weight (excluding batteries)Digitally-regulated output: maintains a constant brightnessReverse polarity protection guards against improper battery installationAll-function switch on the head for simple and convenient operationMade of durable aircraft-grade aluminumPremium Type III hard-anodized anti-abrasive finishToughened  ultra-clear glass lens with anti-reflective coatingThis bundle includes Four EdisonBright Brand CR123A batteries.