... audio input,1 ch audio output USB backup 4CH, H.264, SATA, Support mouse, USB, network, PTZ, IE View, 7" ... 1ch VGA output4ch audio input,1 ch audio outputSupport network remote, USB backupPentaplex, support 4ch playback simultaneouslyRecording bit/ frame ... any size)Backup ModeFlash drive/ USB HDD/ USB CD/DVD-RW / Network downloadNetworkEthernetRJ-45 port (10/100M)Network FunctionsTCP/IP, UDP, DHCP ...