Make no mistake―it might be pocket-sized, but the distinctive Tungsten DF by Armament Systems and Procedures (ASP) packs a punch, blazing 475 lumens for more than a football field in distance. The “Double Tap” option drops the light down to a low 15 lumen setting with just a quick, second press of the tail switch. Dual Fuel technology means you'll never be without a power source―it runs with either a rechargeable 18650 battery (included) or 2 CR123A primary (single use) cells (sold separately).