1. There are two types of cameras: analog cameras and network cameras. If you need remote monitoring, you need a network camera, because this model supports TCP/IP network protocol.

2. Type of hard disk video recorder: DDNS and NNDS. Choose NNDS network hard disk video recorder, because this video recorder has a domain name set by the manufacturer, which is convenient for remote access.

You need a router that supports UPNP. You can ask the computer manufacturer about this.

4. It is very important to set up a router. Make sure that the routing UPNP function is turned on and the routing ports (three) are also turned on. Open the port numbers of these three ports, which can be found in the hard disk video and set in the router, and it will be OK. (It is best to use Hikvision for all cards. )