Viridian’s E SERIES laser sight is specifically designed for the everyday conceal and carry owner. The E-Series Green Laser Sights will easily mount to the trigger guard and features 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; 100 yard range in daylight and 2 miles at night; easy windage and elevation adjustment. Fits the Ruger 5.7.