LED LENSER’s upgraded X21.2 has an impressive run time of up to 100 hours, nearly 400% longer than the original X21, and offers incredible lighting power at 1600 lumens for over 600 meters. Added technology features include Smart Light Technology™, which allows the user to program light functions specifically for the task at hand, and LED LENSER’s Advanced Focus System™ and X-Lens Technology™, both of which improve light customizability and quality. A low battery message system which lets the user know when the light is nearing the end of run time, making the X21.2 one of those true feats of engineering and design that you have to hold to appreciate its impressive power and authority.