From the Manufacturer
This flashlight comes with a high intensity krypton gas lamp for optimum brilliance and extended range. With a twist of the flashlight head, you can change the beam from spot to flood, positioning the light where you need it most. It's anodized inside and out for improved corrosion resistance and durability, with a self-cleaning switch that virtually eliminates oxidation. The high grade O-rings at each opening ensure resistance to water and shock while the low resistance circuitry allows a more efficient use of the batteries. there's an extra lamp in the tail cap to keep you out of the shadows, and this flashlight is serially numbered for identification purposes.
19.50 in. of high-strength aluminum alloy case in black. It features adjustable spot to flood beam rotating switch andplete O-ring seals. Has two high intensity White Star Krypton Gas Lamps for enhanced brilliance and extended range with 36 hours lamp life and 16 hours continuous battery life and 20K Peak Beam Candlepower. It requires 6-D Cell alkaline batteries. Weighs 50.00 ounces with batteries.ATTRIBUTES Batteries Included: No Bulb: Krypton Power Source: D x 6