ZKTeco is a well-known company that specializes in the development and manufacture of security and time management solutions. They offer a range of products, including NVRs (Network Video Recorders), which are used for video surveillance and recording. A 4-channel NVR from ZKTeco refers to a network video recorder that can handle up to four channels of video input. This means it can connect and record video from up to four IP cameras simultaneously.
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