"The Maglite ST3D096 3-D Cell LED Flashlight (Gray) combines MAG-LED technology with three D-cell battery power to provide you with a heavy duty flashlight that you can use for reliable, long range illumination. Along with a high brightness of 131 lumens, the ST3D096 offers a simple twist-top mechanism to adjust the beam from spot to flood.An intelligent battery management system ensures efficient battery usage by adjusting brightness levels according to available battery power. A push button design makes it easy to switch from constant to momentary on-off operation. This flashlight is manufactured with a rugged, machined aluminum casing, which along with an anodized corrosion resistant finish, in and out, ensures high durability at home and in the field.Furthermore, this flashlight has quality O-rings at both ends to prevent water ingress in the bulb and battery compartments. Power is supplied by 3 D alkaline batteries which last up to 72 hours.|""Spot-to-Flood"" adjustable LED beam|Anodized for corrosion resistance and durability|Rugged, machined aluminum case|Momentary On-Off|Intelligent Energy Source Management - continuously monitors the balance between high brightness and efficient power usage allowing for prolonged battery life|Powered by three D-Cell alkaline batteries"