LED Lenser - X21.2 Flashlight, Black PERFORMANCE SPECS: max 1500 lumens (min 250), max distance 600M (min 250M), max battery life 10H (min 50H), water resistance rating IPX4. ADVANCED FOCUS SYSTEM: The Advanced Focus System (AFS) is the patented combination of a reflector AND lens to create a light system that provides both a focused beam for long-distance and a homogenous spill-beam for up-close reading. SMART LIGHT TECHNOLOGY (ADVANCED): Advanced Smart Light Technology also offers two energy modes: Energy Saving mode optimizes burning life, and Constant Current mode features electronically controlled, continuous light output. X-LENS TECHNOLOGY: An industry first, X-Lens Technology combines multiple LEDs into one seamlessly-projected beam of light. Add to that an optimized heat synching system that enables us to drive our LEDs harder and you get unprecedented output from common batteries in handheld sizes. RAPID FOCUS: With our Rapid Focus system you can go from reading to searching by using the thumb on your holding hand to simply slide the bezel away from you. With one hand and one movement, you can achieve seamless transition from close to far and all points in between.