Extensively tested for performance, durability and reliability, you won't find a brighter, higher quality, more dependable light on the market today. With 800 lumens of vibrant white light, our WMLx Series is engineered to be lightweight and powerful, and offers three easy-to-use operating modes: constant, momentary and strobe. At just 4 ounces, its concentrated spot and far-reaching, high-intensity beam provide significant light for situational awareness and long-distance target identification. The strobe function is easily disabled and the easy-to-operate lockout system ensures the light isn't turned on until you're ready. Our all-inclusive rail clamping design integrates seamlessly with your weapon, providing simple, fast mounting with no need for additional tools. FUNCTIONS: Constant / Momentary / Strobe MODES: White OUTPUT: 800 Lumens RUNTIME: High efficiency emitter provides up to 2 hours WEIGHT: 4oz/113.4g with battery. SIZE: Length: 5.34 in. / 13.54 cm Bezel Diameter: 1.125 in. / 2.875 cm MOUNT: Integrated MIL-STD-1913/NAR rail. No tools required. ACTIVATION: Ergonomic contoured design for easy on/off. LOCKOUT SYSTEMS: Safety lever / Head Rotation CONSTRUCTION: Reinforced polymer body offers high impact resistance and durability. Patented heat dissipating vents for improved LED thermal management. WATERPROOF: Up to 66 feet BATTERIES: 2 Lithium 123A included, head removes for battery replacement.