With the on-camera technology of analyzing person and vehicle shapes, RLK16-820D8-A can accurately detect humans and vehicles, ignore other less important objects, and thus greatly reduce the false alarms. Home security jumps from 1080p to 4K Ultra HD – 1.6X clearer than Super HD and 4X clearer than Full HD. The cameras’ infrared lights enable excellent nighttime recording with up to 30 m night vision. RLK16-820D8-A with Power over Ethernet (PoE) technology needs only a network cable for each camera. With 3TB HDD built in and up to 12TB storage capacity, this PoE surveillance kit supports all cameras to record continuously at the same time. You can also access and control your cameras via Reolink APP and Client, besides NVR. Armed with rugged housing, the IP66 weatherproof cameras can stand up to thunderstorms, extreme cold/heat and any other harsh weather.