*The FDE standards for Flat Dark Earth, it is a Tan-ish color.*This ADE RD3-006B GREEN dot comes with a picatinny mounting base. It is also compatible with varies handgun mounting plates*Fully windage and elevation adjustable and lockable; Unlimited Eye Relief. Multi Illumination Settings. Powered by a lithium CR2032 battery(Included)ADE RD3-006,RD3-009,RD3-012,RD3-013,RD3-015 are designed to fit the slide/footprint of plate made for Venom, Fastfire,Meopta,Docter,Insight.Any Plate made for those brands also fits this sight.RD3-018 only Fits RMS/RMSC footprint. RD3-019,RD3-020,RD3-023 fits RMR footprint