Crimson Trace Corporation Green LaserGrip, Fits 1911 Government/Commander, Black 01-4100-1 The LG-401G green laser sight for 1911 pistols combines Crimson Trace's celebrated Lasergrips(R) platform with the visible advantages of green laser technology. Using the smallest laser green laser diode available" the LG-401G emits a powerful green beam yet still provides over two hours of run time on (4) #2016 batteries. The LG-401G utilizes Crimson Trace's famed Instinctive Activation(TM) technology - meaning that when the pistol is held in a normal firing grip" the laser sight is activated. A Master On/Off switch allows the shooter to completely power down the unit for range training without the laser. Green Lasergrips(R) set a new standard in 1911 green laser technology. This product is not compatible with ambidextrous safety levers