The Shield RMSd Glass Edition reflex mini sight features a 4 MOA dot with scratch-resistant ultra clear glass lens and parallax-free optics for precision targeting.Shield RMSd Glass Edition Reflex Mini Sight4 MOA red dot reticleScratch-resistant ultra clear glass lensParallax-free designAerospace-grade aluminum housing with matte black anodized finishVariable intensity drive circuit with automatic brightness adjustmentSide accessible battery drawer (CR1632 battery)Night vision compatibleLow-profile design for co-witnessing with iron sightsDesigned for tactical and sporting applications this compact reflex sight offers reliable performance with convenient battery access and durable construction that can withstand harsh conditions.