... D1 Digital Video Recorder Real-time DVR 2. Support a 2TB HDD, with VGA 3. RS485, mouse, ... USB, 4CH Full D1 Digital Video Recorder Real-time DVR ... Video CompressionSupport 4CH playback at same time.With total 100fps support 4 D1@25fpsWith a ... embedded microcontrollerOperating SystemEmbedded LINUXSystem Resourcesmulti-channel real-time recording and playback, multi-channel net ...