Viridian Weapon Technologies E-Series, Red Laser, Fits Walther P22, CR1/3N Battery, Black, Retail Box 912-0098 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 Green Sight counterparts.