... 3.5mmlinear input interface, one 3.5mmlinear level outputNetworkNetwork protocolTCP/IP, HTTP, ARP, RARP, ICMP, DHCP, DNS, DDNS, PPPOE, FTP, SMTP ... adaptive Ethernet portSerial InterfaceOne RS485 interfaceOthersLinkage AlarmVideo sheltered, motion detective, detector, etc( area and sensitivity setting available)Motion DetectivesupportAlarm InterfaceOne alarm ...