The Crimson Trace LG-404 Red Laser Grip for Compact 1911 features a powerful red laser with 5mW peak and is 620-670nm. The front activation button engages the laser immediately when the firearm is held in a normal firing grip. It gets over 4 hours of battery life and fits all compact 1911's. It can be user installed and does not require a gunsmith to do so. It is also fully adjustable for windage and elevation.