Prepare For Any Emergency. Virtually indestructible high-efficiency LED emitters, 600 lumens of maximum output, precision reflectors, and sleek, corrosion-resistant polymer bodies are the foundation of every SureFire G2 light. The G2X Pro is the most versatile of the series. It features a useful low output of 15 lumens for less critical tasks while extending runtime. Its 600-lumen high output can also reach far into the darkness to light up any environment. Its press/click tailcap switch provides useful momentary-on activation as well as constant-on activation. Features: Two output levels - low for extended-runtime, high for maximum light, Low to high output sequence initiated by a momentary press or full click of the tailcap Virtually indestructible LED emitter regulated to maximize output and runtime Tough, lightweight polymer body for corrosion resistance and durability High-strength aerospace aluminum bezel is Mil-Spec hard-anodized for extreme durability Key Attributes: High Output: 600 lumens High Runtime 1.5 hours Peak Beam Intensity: 8,700 candela Batteries: Two 123A (incl.) Switching: Click tailcap Length: 5.2 in (13.2 cm) Low Output: 15 lumens Low Runtime: 52 hours Distance: 187 meters Body Construction: Polymer/aluminum Finish: Mil-Spec Hard Anodized Bezel Diameter: 1.25 in (3.2 cm)