Crimson Trace LG-435 Laserguard Red Laser Sight for KEL-TEC PF9 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 Keltec PF9 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 laser is in conformance with and complies with 21 CFR 1040.10 with a maximum power output of "5mW" for a "Class 3R Red Laser. Compact under-barrel laser sight for polymer framed pistols Instinctive activation; hard polymer, rubber overmolded front activation Fully adjustable for windage and elevation No modifications required for installation