Crimson Trace LG-919 Master Series Red Laser Sight for 1911 Full-Size G10 Pistols (Red Laser Sight) N/A Made in USA 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 one 1/3N Battery (included). this product is eligible for Crimson Trace free batteries for life program Easy installation: user installed- no gunsmithing Required. Factory sighted at 50 feet, but is fully user adjustable for windage and elevation with provided tool Fits: 1911 full-size G10 pistols