Viridian's E-Series line is specifically designed for everyday concealed carry and is available for the top brands and handguns on the market. The E-Series Green Laser Sights will easily mount to the trigger guard and feature an ambidextrous on/off button with a 5-minute auto shut off just like their Red Sight counterparts. Features : Easy installation onto the trigger guard of your pistol Ambidextrous on/off button with 5 min auto shut off Up to 100 yard range in daylight and 2 miles at night Constant laser with 60 min battery life Easy windage and elevation adjustment Fits the Taurus GX4