Crimson Trace LG-483 Laserguard Red Laser Sight for Beretta Nano Pistols 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 one 1/3N Battery (included). This product is eligible for Crimson Traces Free Batteries For Life Program. FITS Beretta Nano 9mm EASY INSTALLATION: User installed- no gunsmithing required. Factory sighted at 50 feet, but is fully user adjustable for Windage and Elevation with provided tool. Instinctive activation and fully adjustable for windage and elevation Manufactured to fit seamlessly with the firearm frame No gunsmithing or frame modifications required for installation Proudly made in the USA