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.
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.