Main features - The digital video recorder records video from monitoring cameras to its internal hard disk, it can display the video being displayed on a monitor split into four, nine or sixteen screens, and it can also display recorded video in the same way. The DSR-3709 can only display split screen video in four or nine screens. - Separately-sold hard disks (80, 160, 250, or 300 GB) can be installed to further increase this large memory capacity. - Complete range of recording and playback functions - Simultaneous recording and playback of video. - Timer recording allows recordings to be made at different times each day. - Zoom allows a certain section of live and playback video to be magnified. - Alarm recording allows the actions of intruders to be recorded. - The video from specific cameras can be masked using a gray pattern to prevent it being monitored. - Motion sensing can be used with each camera, and alarms can be setup to give priority to the recording of moving images. - By connecting multiple digital video recorders, it is possible to perform analog series recording in which, once the capacity of one hard disk is reached, recording continues automatically on the next digital video recorder. - Search function - lets you instantly display the desired recording. (