Surefire L5 Lumamax Flashlight LED light source has no filament to burn out or break, lasts for thousands of hours Rugged aerospace-grade aluminum body, Mil-Spec Type III hard anodized in olive drab Tailcap switch: press for momentary-on, press further to click constant-on Max Output: 100 lumens : Runtime: 5 hours : Length: 6.10 inches Weight: 7.20 ounces : Battery: Two 123A lithiums : Patetented lockout tailcap prevents accidental activation during transport or storage