Batteries may need to be replaced due to being new old stock. Crimson Trace CMR-207G Rail Master Pro 01-7720-1. Fits most pistols, rifles, and shotguns with M1913 Picatinny or Weaver accessory rails. Green laser and 400 lumen LED white light. 5 minute auto shut-off. Modes: Laser + Light; Laser only; Light only. Battery life: 50m with light/laser on. Polymer and aluminum construction. Boxed with hanging tab. BRIGHTNESS: Features a 400 Lumen flashlight and a 5mW peak, 620-670nm, Class 3R visible green laser that is in conformance with and complies with 21 CFR 1040.10 with a max power output of “5mW” for a “Class 3R Green Laser” – brightest beam allowed by law. RUNTIME: 1.5 hours of battery life that runs on (1) CR123 lithium battery (included) with Laser, Light and Laser+Light Modes. VERSATILITY: Can be used on most pistols, shotguns and rifles that have an M1913 picatinny and weaver-style accessory rails – including Walther PDP. DURABLE: Constructed of anodized aluminum with polymer paddles and water resistance for long term use.