The LG-499G Laserguard® is a powerful green laser sight designed for the Heckler & Koch® (HK®) VP series of pistols including: VP9, VP9SK and VP 40. Featuring a 5mW peak, 620-670nm, Class 3R green laser beam, the LG-499G is operated by Crimson Trace’s famed Instinctive ActivationT which allows the unit to spring to life with a normal firing grip. This model features a front activation button. BRIGHTNESS: Features a 5Mw peak, 515-532nm, class 3R visible green laser – the brightest beam allowed by Law. INSTINCTIVE ACTIVATION: Front activation button engages the laser immediately when the firearm is held in a normal firing grip – This is the feature that sets Crimson Trace apart from the rest. RUNTIME: Over 2 hours of battery life. EASY INSTALLATION: User installed- no gunsmithing required. Factory sighted at 50 feet, but is fully user adjustable for Windage and Elevation with provided tool. FITS: Heckler & Koch VP9, VP40 & VP9SK. SPECS: This Class IIIA (IIIR) Green laser sight has a maximum output power of? 5mw featuring a wavelength of 520 nm with a beam range of 200 meters in high illumination (lux) direct sunlight conditions to over 2000 meters at night.