The 3x Spitfire combines an impressive array of high-performance features into a rugged, ultra-compact package. When fast target acquisition in close- to medium-range shooting applications is a priority, the Spitfire excels. Laced with advanced features, the sophisticated prism-based design allows for a more compact optical system without sacrificing optical quality. The EBR-556B reticle is etched directly on the prism to assure consistent point-of-aim at all times with selectable red/green illumination of five intensity levels to match specific conditions. Prism scopes are not compatible with the VMX-3T Magnifier. Please update the above details, thank you. Dual picatinny rails mounted on the Spitfire allow the optic to be paired with an offset auxiliary reflex sight. A fast focus eyepiece adjusts the reticle into sharp focus.Battery Life: Up to 250 hours on highest setting. Up to 3,000 hours on lowest setting.