The 6150011 Receiver is used in conjunction with the Plug & Play remote control. Upto nine of these units can be controlled when wired into separate circuits (max 150w per circuit).
The receiver which can be used outdoors simply plugs into the 12v socket of the transformer or the main cable supplying the 12v power to the lights. You can provide nine individual circuits all of which can be controlled via the remote. Full instructions are supplied with the product.