The Mepro MPO-DF is an open reflex red dot sight specially designed for full-sized pistols.This cost-effective optic punches far above its cost. It features a 3.5 MOA ret dot reticle, RMR footprint, automatic and manual brightness controls, CR1632 battery lasting 2 years plus while being water, shock, and fog proof makes this optic stand out from the crowd.The Mepro MPO-DF allows you to upgrade your current sighting system with money left over for more ammo. RMR FootprintAutomatic Brightness / Manual Brightness AdjustmentShake Awake FeatureIPX7 WaterproofMil-1913 PIcatinny Adapter includedPower Saving Sleep ModeMEPROGUARD Warranty