Machined of aircraft quality aluminum and sealed with an o-ring for maximum water resistance. With less than a quarter turn of the liteft.;s head cap, the patented cam-action focusing beam adjusts from a far reaching spot to a soft overall flood. The patented triple action self-cleaning rotating internal switch has a flush sealed rubber thumb button. Spare bulb stored in end cap. Available: 3D Cell, 4D Cell, 5D Cell (2D & 6D Cell no longer avilable).