In the CCTV system, DVR is a system and a device used to record all the images sent by CCTV cameras. DVR is an abbreviation of "Digital Video Recorder", the functions of the DVR itself perform image recording media into a digital format to a disk drive, USB flash drives, memory cards and others. DVR not only exist in the CCTV system, DVR is also widely used for consumer digital video recorder.
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