The Inforce WML is an ultra bright 400 lumen weapon mounted light. It mounts quickly to your 1913 picatinny rail and provides increased visibility when you need it most. Allows constant, momentary and strobe light functions at the click of a button. The WML is made of glass reinforced nylon 6. This allows for lightweight yet durable construction. It is impervious to dust, sand, and dirt, and is waterproof to 66 feet. Manufacturer part number: IF71002 Features: High output: 400 Lumens Peak beam Intensity: 4,000 candela Distance: 413 feet/126 meters High runtime: 1.5 hours Batteries: One 123A included Weight with batteries: 3.2 oz/91.2 g Length: 4.2 in/10.7 cm Bezel Diameter: 1.0 In/2.7 cm Switching: Rear Facing Non Slip Button Functions: Constant/Momentary/Strobe Lockout system: Safety Lever/Head Rotation Mounting: Integrated Clamp Construction: Glass Reinforced Nylon Color: Black Waterproof: Up to 66 feet/20 meters