Whether you're flying an F/A-18 or conducting a HALO insertion, the SureFire M2 Centurion won't let you down when the going gets rough. Powered by two lithium batteries (10-year shelf life), the M2 produces 65 lumens of light for one hour, or 120 lumens (eight times the output of a typical two D-cell alkaline flashlight) for 20 minutes using the included ultra-high output lamp. CNC machined from aerospace-grade aluminum and coated in a military specification Type III hard-anodized finish, the M2 utilizes an ergonomic flat-side CombatGrip design and a patented rubber grip ring so that the light can be operated with a handgun using the Rogers/SureFire technique. Like all lights in SureFire's Special Operations Series, the M2 is shock isolated to withstand the repeated recoil of a large caliber weapon. The M2 Centurion features unique switching originally developed for law enforcement- twist for constant on, or depress the tailcap button for momentary illumination or emergency signaling.