Crimson Trace LG-308 Lasergrips Red Laser Sight Grips for Smith & Wesson K/L Frame POWERFUL RED LASER: Features a 5mW peak, 620-670nm, Class 3R visible red 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. OVER FOUR HOURS OF BATTERY LIFE: Powered by two #2032 Batteries (included). This product is eligible for Crimson Traces Free Batteries For Life Program. FITS: Smith & Wesson K & L Frames Round Butt, Including Governor EASY INSTALLATION: User installed- no gunsmithing required. Factory sighted at 50 feet, but is fully user adjustable for Windage and Elevation with provided tool. This model features a master ON/OFF switch for completely powering down the unit. Beam intensity: 5Mw peak, 633nm, class IIIA laser. Maximum output that federal Law and technology allow Manufactured to fit seamlessly with the firearm frame No gunsmithing or frame modifications required for installation Rubber overmolded, front activation, master on/off switch Proudly made in the USA