The Meprolight MPO-DS Reflex Sight is an open reflex red dot sight designed for subcompact or slimline pistols. This cost-effective optic punches far above its cost. It features a 3.5 MOA red dot reticle, RMSc/JPoint footprint, automatic brightness control, CR2032 battery lasting 3 years plus while being water, shock, and fog proof.The Mepro MPO-DS allows you to upgrade your current sighting system with money left over for more ammo.FeaturesRMSc FootprintAutomatic and Manual Brightness AdjustmentsShake AwakeIPX7 Waterproof