Crimson Trace Rail Master Pro Laser Sight and Tactical Light for Rail-Equipped Pistols POWERFUL RED LASER & LED WHITE LIGHT: Features a 5mW peak, 620-670nm, Class 3R visible red laser - the brightest beam allowed by law - with a 100 Lumen LED tactical white light. INSTANT ACTIVATION: Ambidextrous Tap-On / Tap-Off Controls for immediate laser and/or light activation from either side of the unit. Includes Laser + Light, Laser Only, Light Only and Laser + Light Strobe modes. OVER TWO HOURS OF BATTERY LIFE: Powered by one CR2 Battery (included). This product is eligible for Crimson Traces Free Batteries For Life Program. FITS: most pistols, rifles, and shotguns with M1913 Picatinny or similar Accessory Rail & 1-1/16" between the recoil lug and the trigger guard. EASY INSTALLATION: User installed- no gunsmithing required. Four fit inserts are included for specific firearm fit. Factory sighted at 50 feet, but is fully user adjustable for Windage and Elevation with provided tool. WARRANTY: 3 Year Manufacturer Warranty and FREE Batteries for Life