Wired NVR systems are hardwired into the home, transmitting video and audio signals from the cameras to the recorder through Ethernet cables, with power to the cameras via PoE. NVR systems are typically more feature-rich than DVRs with digital video from, and more of the video processing occurring in, the cameras than the NVR.
Wired DVR systems are similar to Wired NVR systems except that the video signal is transmitted via Co-Axial cables and each camera needs to directly connect to a power socket. Additionally, more of the processing, including converting analog video from the cameras into a digital signal, is carried out by the DVR instead of within the cameras in an NVR system.
Powered Wi-Fi systems transmit signals through the home’s Wi-Fi network instead of using Ethernet cables, but the cameras still need to be plugged into a power source.
Wireless or Wire-free systems also transmit signals through the home’s Wi-Fi, but use rechargeable battery-powered cameras that don’t need to maintain a connection to a power source.