The 1x20mm Green/Red Dot Sight from Barska provides the user with pinpoint accuracy and a wide field of view for extra fast target acquisition. This versatile Dot Sight is perfect for use with handguns, rim fire rifles, shotguns, and even crossbows. The adjustable rheostat allows the user to switch between a Red or Green Reticle, and features 5 levels of variable brightness control. This feature allows the user to choose the most optimal reticle for the current environment, ensuring a bright reticle for targeting in any lighting situation. Anti-reflective coating, unlimited eye relief, a Dovetail/Weaver style Exchangeable Mount, and multi-coated optics provide the 1x20 Green/Red Dot Sight with optimum performance at an affordable price. Includes one CR2032 Lithium battery.