Chris, the smoker's power cord plugs into the back of the Auber, and that's how it controls the element. You turn your control dial all the way up, and the probe and power cord go into the Auber, and the Auber into the power outlet. It feeds power to the smoker through the power cord.
I find the best way to use the standalone Auber is to bypass the stock controller (cut out the "middle man," so to speak). That way, the Auber is in total control of the element, with no potential bottleneck. There are instructions, in the Auber section, on how to do this - it's very easy, and can be done when you install the wall probe.