... monitoring RS485, TV, VGA output DVR3104 Low cost 1U DVR Dahua > Up to 4 ... Pre-record: 1~30 sec., Post-record: 10~300 sec.Video Detection Trigger EventsRecording, PTZ movement ... USB CD&DVD-RW / Network downloadNetworkEthernetRJ-45 port (10/100M)Network FunctionsHTTP, TCP/IP, UPNP, RTSP, ... 10 ~+55°C / 10~90%RH / 86~106kpaDimensionMini 1U, 325mm×245mm×45mm(W×D×H)Weight1.5KG(without HDD) Item DVR3104 Low cost ...