Tafilad

Hi, Can you help? I want to install four cameras in some out buildings and cannot run cables. I am looking at using network extenders for power and an ip connection which i think will work,But i am struggling to understand how to connect to a NVR all the advice i can find is showing POE.Can i just plug the NVR into the same network and receive all the cameras like this? Embarrassed i know so little about this