The E21 is a two stage light made with simple operation in mind. By the easy twist of the head, the owner can go from a long runtime 48 lumen beam to a long reaching 150 lumen beam. Add the fact that it runs off of affordable and easy to find AA batteries and this could be the perfect light for all adventures, where ever you may be. Product Features: * Cree XP-E LED with lifespan 50,000 hrs * Uses two 2 AA (Alkaline, Ni-MH) batteries * Max Brightness: 150 lumens * Low Bright: 48 lumens * 6.5" (Length) x 1" (Diameter) * Weight: 3oz * Output: 2 types * Patented physical structure avoid circuit damaging from reverse connection of battery * Tactical push-button tail cap switch * Toughened ultra-clear double glass lens with anti-reflective coating * Waterproof to IPX-8 Standard