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The Electronic Video Recorder ( DVR ) is the primary element of almost any conventional surveillance system . Security DVRs accept the video recording feed from the surveillance camera and transforms it into a practical , replay-able video clip file . Each one of our Video surveillance DVRs are jam-choked with capabilities such as : Remote control accessibility from smart phones , tablets , and PCs , movement initiated video recording , H .264 compression , realtime video recording , network performance optimization ( dual-streaming ) , High-definition multimedia interface 1080p out port , USB back-up , as well as unquestionably dozens upon dozens of tunable configurations and features .