The Trijicon Specialized Reflex Optic (SRO) is a 2.5 MOA Adjustable LED red dot sight. The wide field of view and clean, crisp dot makes it easy for users to find and track the dot, helping improve shooting accuracy and speed. Features both manual and automatic LED brightness modes and a 3-year battery life. The SRO is designed to survive the rigors of slide ride pistols and is engineered for hard use and it has been tested to survive typical pistol mounted drops. Manufacturer part number: SRO2-C-2500002