This is a Vivotek thermal-imaging bullet camera fitted with a 50mm lens, a security/surveillance camera that detects heat signatures rather than relying on visible light — meaning it can spot people, vehicles, or animals in complete darkness, smoke, fog, or glare where a normal optical camera would fail. A 50mm thermal lens gives a narrower field of view with longer detection range compared to a wide-angle lens, making it suited to perimeter security over open ground — fence lines, large yards, ports, or industrial sites — rather than close-range indoor monitoring. It's typically used alongside a video management system (VMS) or NVR as part of a broader security/CCTV installation, often paired with analytics for intrusion detection.