The CCTV camera system at first only consists of security cameras and monitors. Afterwards, various recording units come out for video storage and review.
A CCTV camera system, with full form in English as closed-circuit television camera system, is showed in the following diagram.
Security cameras are used to capture live stream through the lens. After years of development, surveillance cameras can provide higher resolution images and clearer audio.
Even in total darkness at night, security cameras with color night vision technologies can also see clear images in true color.
Moreover, most CCTV cameras equipped with motion detection sensors can trigger alarms when there are human movements. They are a dependable safeguard against burglary and theft.
After capturing videos or audios, CCTV surveillance cameras transmit signals to the security camera recorders for documenting and replaying key moments. DVRs or NVRs are often employed in the CCTV camera system, realizing 24/7 reliable recording.
Note: Some high-end closed-circuit television cameras (the full form for CCTV cameras), also come with a micro SD card (slot) for local storage of motion events when they are detected.
Video clips recorded in the DVRs/NVRs or SD cards can be replayed anytime in your mobile phone, computer or TV monitor, even you are far away.
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