The versatile Tru-Brite red-dot sight by Truglo gives you the option to switch between red and green illuminated dots, ensuring easy target acquisition in any light. It's click-adjustable for windage and elevation. A rheostat controls reticle brightness. Unlimited eye relief and a wide field of view team to get you on target fast. Integrated Weaver-style mounting system. 3V-CR-2032 battery included. Limited lifetime warranty.