LG-415 Lasergrips are designed to fit Ruger LCR and LCRx revolvers by simply replacing the factory grips. This laser sight features Crimson Trace’s famed Instinctive Activation, which activates the laser when the firearm is held in a natural firing grip. Laser activation button is located in the front, and the unit includes a Master On/Off Switch for completely powering down the unit. With battery life of over four hours and fully adjustable for windage and elevation, the LG-415 is quickly user-installed in moments with zero alterations to the firearm. BRIGHTNESS: features a 5Mw peak, 515-532nm, class 3R visible green laser – the brightest beam allowed by Law. INSTINCTIVE ACTIVATION: 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 4 hours of run time. 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: Ruger LCR and LCRx Revolvers. 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.