Even though it's compact at only 7" long 1" in diameter, this light is really bright at 55 lumens. It will run continuously for up to 4 hours and the LED has a 50,000 hour life span. Impervious to shock, the housing is built of strong, anodized aluminum with a knurled anti-slip design. Easy-to-use one-handed operation with the button built in to the cap switch. Keep one in every car, your toolbox and the bedside nightstand. Includes a nice nylon holster and two AA batteries.