The Sig ElectroOptic Romeo4 Pro is designed built and tested for hard professional use. The red dot sight features high performance lens coatings for elite performance in bright light or passive NV conditions top mounted activation with NV Override control four onboard user selectable reticle options durable .50 hex mount 9 daytime settings three NV settings three mounting heights come standard in the box and 50000 hour runtime with common AAA Battery. Includes clear flipbacks opaque front flip back and ARD KillFlash. Assembled in USA.