The Trijicon SRO (Specialized Reflex Optic) is specifically designed for pistol use. The wide field of view and clean, crisp dot makes 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). These features make the SRO a great choice in any application.