Night vision amplifies the small amount of light already present, so you can navigate, observe and identify without putting out a white light. The range here comes from AGM Global Vision: Gen 2+ PVS-14 monoculars in white and green phosphor for handheld, head or helmet-mounted use, alongside the Spectrum LRF 4K, a digital day/night scope that shoots in full color by day and works off an IR source after dark.
For heat-based detection rather than light amplification see thermal optics, or browse the full AGM Global Vision range.