Compact, ultra-lightweight hand-held light packs powerful c4 led technology to deliver a super-bright 120 lumen (4,800 candlepower) beam. Features a rugged, high-impact polymer body, with deep grasping grooves for a non-slip grip. O-ring seals make the light waterproof down to 1 meter for 30 mins. The led lamp is far more resistant to shock than traditional filament lamps, and has a 50,000 hour lifetime expectancy. Push-button switch in the tailcap provides one-handed momentary or constant-on operation. Rotate the cap to "lockout" off position to prevent accidental activation and battery run down. Three hours of continuous runtime on two batteries. Mfg: streamlight specs: reinforced nylon polymer, black or coyote. 5¼" (13.3cm) long, 1" (2.5cm) o.d. 4.1 oz. (116g) wt. Two cr-123a lithium-ion batteries included.