The Armasight Vulcan 6x IDI MG is a generation 2+ night vision rifle scope for sport shooters and hunters. The Gen 2 image intensifier provides a high resolution between standard and High Definition images, this is called Improved Definition. The Manual Gain Control give you the best possible image contrast under very high and very low light conditions. The adjustable brightness illuminated reticle is unique; no other night vision rifle scope on the market has such well-defined (yet extremely thin) crosshairs that allow such precise shot placement, even on exceptionally small targets. The body is made of high quality aluminum and is resistant to all weather types. Armasight designed and built this unit to surpass MIL-SPEC-810 specifications, and as such, the Armasight Vulcan can withstand salt water, rain, high humidity and extreme temperatures, and still provide unsurpassed levels of performance.