Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a set of monitors. It consists of surveillance controller, display screen, lens and video recorder.

Lens

Network Video Recorder (NVR)
Recommended for newer HD surveillance camera systems

Digital Video Recorder (DVR)
Recommended for older analog CCTV systems

Remote Video Surveillance System
Most of digital video recorders can transmit video signals to intranet or internet while recording. Authorized person can control the system remotely.

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