For handguns, shotguns, rifles and paintball guns, this red dot sight has the power and construction to last through any shooting application. Features include unlimited eye relief, a wide field of view and an 11 position rheostat for brightness control. 1 MOA (1″ @ 100 yd.) click windage and elevation adjustments. Limited lifetime warranty. Powered by a single CR2032 3V Lithium battery.