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 Footprint Automatic Brightness / Manual Brightness Adjustment Shake Awake Feature IPX7 Waterproof Mil-1913 PIcatinny Adapter included Power Saving Sleep Mode MEPROGUARD Warranty