Machined aluminum construction, anodized inside and out for improved corrosion resistance. Sealed at both ends with high-grade rubber o-rings and lip seals. Next-generation LED (Light Emitting Diode), twist head to turn on, turn off, and focus. Includes a convenient, durable holster. 272 Lumens. 6.6" L x 1" Dia. Requires (2) AA batteries, included.