Hydrawise manufactures several different controllers. When you add a controller in the software application or mobile app, you will see the message below if the controller model in not selected. The next step after adding the Controller Name, Serial Number, and the Location is to click NEXT (blue arrow in mobile APP version). You can CREATE the controller after a model is chosen. If for any reason the model is not known, you can choose any of models temporarily.
The model can be edited later in the controller settings using the instructions in article here.
You can add the serial number at a later time as well if needed using the instructions in this article.