It has two that have screws and connectors already plugged into. I found that there is a black plug between them and was able to pull it out and saw where it fit the same sized screw as the other two posts. I connected the black wire to that, and have the feeling this is what they were talking about. My fermentation box has not heated up like it did before and when I test the controller it kicks on when I move it to A higher temp the what is being read inside the box then shuts off when I raise the temp further. I think I have it figured out.