... , support earphone or power amplifier / optionalNetwork Port 10-100M Ethernet RJ45 port USB Port1 USB port, support max.64G U disk recording , SD ... /HTTP/RTSP/FTP/PPPOE/DDNS/NTP/UPnPPTZ Control RS422/RS485 Serial Port. , support multiple PTZ control protocol, such as PELCO (P) / PELCO ...