Standalone DVR and NVR systems that allow multiple cameras to be recorded on one hard drive. They allow the recording of images from several video cameras and subsequent access to the images in case of need. The ultimate solution for a closed circuit television (CCTV) system for video surveillance. DVR is the acronym for Digital Video Recorder, which allows the use of CVBS video cameras. NVR is the acronym for Network Video Recorder, which allows the use of TCP / IP video cameras over the ethernet network.