Viridian E-Series Laser Sight <5mW Red laser with 635-650nM Wavelength 25 yds Day/1 mi Night Range Black Polymer for Ruger 709,740 Slim 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 Red 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.