Comes with 4 Surefire CR123A Batteries (2 Factory Installed) and Lightjunction Battery Box
SureFire's G2X LED illumination feature a virtually indestructible high-efficiency LED emitters, 600 lumens of maximum output, precision reflectors, and sleek Nitrolon polymer body. This illumination tool is ideal for outdoor use, emergency preparedness, everyday carry, or use by EMTs and other first responders.
The G2X Pro is a dual-output that features a lightweight, ergonomically shaped body. It boasts 600 lumens of high-output light, but it also features a useful low-output of 15 lumens that lets you extend the runtime per set of batteries. The G2X Pro comes with a press/click tailcap switch.
Specifications
Output/RuntimeHigh: 600 Lumens / 1.5 hours
Low: 15 Lumens / 52 hours

Length: 5.20 inches
Bezel Diameter: 1.25 inches
Body Diameter: 1.00 inches
Weight with Batteries: 4.4 ouces
Batteries: 2 123A
Features
Virtually indestructible LED emitter regulated to maximize output and runtime
Brilliant tactical-level max output and, useful extended runtime low output
Precision reflector creates a smooth, optimized beam with plenty of reach and surround light
Tough, lightweight Nitrolon polymer body for corrosion resistance and durability