The Trijicon SRO^® (Specialized Reflex Optic) is designed with a maximized field of view and a clean, crisp red dot that deliver improved pistol accuracy in competitive-shooting and target-shooting applications. It’s also engineered with Trijicon’s legendary durability, so it can withstand abuse on and off the range. The wide field of view and clean, crisp dot make it easy for users to find and track the dot in both target and competitive shooting applications, helping improve shooting accuracy and speed. Every SRO features both manual and automatic LED brightness modes. Additionally, a top-loading CR2032 battery provides a 3-year battery life (at setting 4 of 8).