This Maglite flashlight has four unique settings for effectiveness in the field. Choose from strobe, signal, S.O.S., Nite Lite, or "normal" settings. Engineered for optimum light output, you"ll love the tough, super rugged construction that comes standard with Maglite models. It has rugged machined aluminum construction, with shock and water resistance for long life. It"s anodized inside and out, too, for increased resistance to corrosion. This flashlight measures only 4-4/5 inches and weighs just under 4 ounces. with batteries, and runs on three "AAA" batteries.