... video compression. DVR7604S 4ch stand alone DVR Features: 4 channels cost-effective standard DVR 4 Channel D1 real-time preview H.264 dual- ... blank, video loss Easy backup: USB devices, network download Built-in web server, Support CMS, NAT traversal Support ... ServerRemote OperationMonitor, PTZ control, Playback, System setting, File download, Log informationHard DiskHard Disk1 SATA port, Max 2TB HDD ...