NIGHTvision uses a Thermal imaging camera integrated into the Tail Unit alongside the regular wide-angle camera. It detects wavelengths of light in the thermal range 800-1400 nm rather than 400-750nm (regular light we see). This camera detects heat radiating from warmer objects. If a vehicle is in complete darkness, or occluded in fog or smoke, or the headlights are dazzling to a regular camera, a thermal camera can still illuminate the scene by sensing the heat radiating from the object.