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A digital video recorder (DVR) is an electronic device that records video in digital format to a USB flash drive, SD memory card, disk drive and local or networked mass storage device.
So, you are in the market for a CCTV DVR? A DVR stands for a Digital Video Recorder and it allows you to record the the live surveillance video that is being captured by your security cameras. DVRs are manufactured with the number of channels in multiples of 4, so if you have 13 surveillance cameras, you will need a 16 Channel DVR.