DVR Support VGA output. 4CH Video input,1CH Video output;1ch audio-in,1ch audio-out . Support VGA ... Windows OSD interface,intuitive user-friendly navigation menu.4CH Video input,1CH Video output;1ch audio-in,1ch audio-out .Multiplex function ... ,playback,backup simultaneously,independently of each other.Support Multiple channel playback simultaneously,to facilitate comparison the different channels of ...