NVR should have networking with web interface function which is cheapest possible way to connect. 1. Through internet. You can connect NVR to the router and expose it to the internet. Easiest setting is set DMZ with your NVR IP address. You need secure your NVR by giving it a secure password. Then you can connect to the NVR from smart phone or pc from anywhere across the earth. 2. Through LAN connection. CAT5/6 cable max length is 100 Meter. For more than that, you need to use CAT5/6 to Fibre Optics converter and run it over Fibre Optics wire.
