I love this plug-in power supply, but one element is missing: the electrical wiring. It doesn't matter except that I was expecting slightly different content. I've seen similar versions with an extension connecting the top and bottom boxes. Aside from having to go to the hardware store, installation was easy if you followed the instructions. The manufacturer recommends professional installation, but I think if anyone has the ability to install a switch, lamp, or outlet, they can probably safely install this kit.