Most of our DVR CCTV Kits have the POC (Power over coax) function, this means all of the cctv cameras are connected and powered from the back of the recorder using coax cable. Although less expensive than their counterpart POE (Power over ethernet). These high quality camera kits have some great image detail and are a breeze to setup and install. If you're looking for kits with built in microphones view our AOC (Audio over coax range)