... in web server, Support CMS, NAT traversal *4 Channel D1 Dual-stream Video Compression Standalong Security DVR , CCTV Digital Video Recorder ... standard DVR *4 Channel D1 real-time preview *H.264 dual-stream video compression *VGA /BNC synchronous video output *4 channel ... , Log informationHard Disk1 SATA port, Max 2TB HDD supported Dual-stream Video Compression Standalong Security DVR(JD-DVR7604S)