16 channel h.264 dvr Video Compression:H.264 ... USB HDD / USB CD/DVD-RW / Network downloadNetworkEthernetRJ-45 port (10/100M)Network FunctionsTCP/IP, UDP, DHCP, DNS, IP ... System setting, File download, Log informationHard DiskHard Disk1 SATA port, Max 2TB HDD supportedAuxiliary InterfaceUSB Interface2 ports, 1 for ... , 1 for backupRS232Dahua keyboard, PC communicationRS485PTZ control 16 channel h.264 dvr