![]() We will use the TechPro Security Product’s “ 4 Channel Ultimate Mini Series D1 Real-time Security DVR” to explain the most common inputs and outputs.Ībove is the back of the DVR-LT4120MHD sold by Looking from left to right you will see several components, ports, and jacks with labels such as “Video In”, “Video Out”, “Mic In”, “Spot”, “RS232”, “VGA”, “HDMI”, and so on. ![]() Although the various features and options vary between models, there are usually standard components that can be found on most DVRs. At first glance the back of a security DVR might look very complicated to the average person.
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