Please click link to video for installation instructions below. E-Series Installation Viridian's E SERIES laser sight is specifically designed for the everyday conceal and carry owner. This model specific, trigger guard mounted, laser sight offers the most powerful red laser legally available, delivering rapid target acquisition when you need it most. Easy installation onto the trigger guard of your pistol Ambidextrous on/off button with 5 min auto shut off 100 yard range in daylight and 2 mile at night Constant laser with 60 min battery life Easy windage and elevation adjustment Green laser  Fits the Taurus® GX4/GX4XL Does not fit Taurus® GX4 CarryÂ