NV-D01 is a mil-spec and versatile night vision sight. It can be used handheld, head mounted or helmet mounted for hands-free, or attached to a camera or camcorder for nighttime photography and law enforcement to document. This system enables walking, driving, short-range surveillance, map reading, vehicle maintenance, and administering first aid in both moonlight and starlight. With automatic protective system controls, the monocular will shut off automatically if the illumination level surpasses 40lux for the following 10seconds. And automatic brightness adjustment system always keeps IIT brightness level constant. They're easily replaced with 3x,5x,6x lens for enhanced range performance.