Short-range Thermo GLN-S1802 Thermo night vision Short-range Thermo night vision sensitive Imager-Elfin Series GLN-S1802 specificationGLN-S1802GLN-S2635GLN-S3650GLN-S13750Visibility480TVL480TVL480TVLColor 550TVLBlack and white 680TVLZooming-in times216 times (18X, 12X)312 times (26X, 12X)432 times (36X, 12X)444 times (37X, 12X)Zooming4.1-73.8mm3.5-91mm3.4-122.4mm3.5-129.5mmFocal length of thermal ...