... , Pause, Stop, Rewind, Fast play, Slow play, Next file, Previous file, Next camera, Previous camera, Full screen, Repeat, Shuffle, ... Alarm ServerRemote OperationMonitor, PTZ control, Playback, System setting, File download, Log informationHard DiskHard Disk2 SATA port, Max 4TB HDD ... stand alone DVR with H.264 dual-stream video compression,4 Channel D1 real-time preview ,DVD-RW function, alarm function