This is a stand-alone detection system that announces the arrival of every vehicle in the driveway through audible alerts strategically placed both in and outside the home. A second, 15 watt relay will turn on up to 1800 watts of lights at night. It also triggers CCTV, RF and satellite transmitters, etc. The CF-3C Control Board by Cartell is a stand-alone board that is exclusively made for use with the CF-2C Model Control Unit. Does not include case or transformer