User's Manual

4.2 CAN BUS
There are two ports(CAN1&CAN2) for communication
5 PIN Avation female connect to 5 PIN Avation male on the DVR
4.3 LAN
7 PIN Avation female connect to 7 PIN Avation male on the DVR
4.4 Four-in-one antenna(GPS-3G-4G-WIFI)