TRUGLO Red-Dot Open Sight Tru-Point Black Incredibly compact design. Shock resistant. Unlimited eye relief. 4 MOA reticle for fast target acquisition. Light sensitive rheostat automatically adjusts the brightness of the aiming dot. Low-power consumption for long battery life. Battery can be replaced without removing the sight. Windage and elevation adjustments with locking screw. Integrated Weaver-style mounting system. Removable composite cover included. Battery included (3V-CR2032). Lifetime Limited Warranty.