Crimson Trace LG-903 Master Series Lasergrips Red Laser Sight Grips for 1911 Bobtail Pistols - Rosewood POWERFUL RED LASER: Features a 5mW peak, 620-670nm, Class 3R visible red laser - the brighest 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 #2025 Batteries (included). This product is eligible for Crimson Traces Free Batteries For Life Program. FITS most Bobtail 1911 Models 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.