1.Russia Gen2+ tube 2.Cheapest Gen2+ NV 3.Built-in long range IR 4.Auto shut off systems 5.5x lens viewing long distance Specifications Magnification ,x3 5 5+Objective lens diameter,mm44 50 60Lens system59mmF/1.2 88mmF/1.7 100mmF/1.7FOV at distance 200yards,ft/m197/60 138/42 118/36Focus range,yards1.5 to infinity 1.0 to infinity 1.0 to infinityEye relief distance,mm 15Dioper setting,D +4,- ...