3MOA Micro Green Dot: The VOTATU PMD504-SG is a open reflex sight for RMR footprint cut pistols and picatinny rail mount . Featuring a GREEN 3 MOA aiming dot with a 24mm window for quick acquisition..10 Illumination Settings: 10 bright settings, fully multi-coated lens that increase light transmission and clarity in any environment..Shake Awake : After about 225 seconds without sensing any motion, the sight will enter into sleep mode. Even the slightest movement will wake it up to the previous brightness setting..Convenient Tray Battery Compartment：The readily available CR1632 battery is side-loading, allowing for quick battery replacement without having to remove the sight from the firearm. No more Re-zeroing..Built To Last : This Red Dot Sight housed in durable yet lightweight aircraft-grade aluminum for use in any environment. IPX7 waterproof, fogproof and shockproof construction..IMPORTANT NOTES：The PMD504 is compatible with RMR footprint , please make sure you have the RMR cut slides on your handgun, otherwise, you may have to find the correct adapter plate to fit this optic.