I have been installing the Hunter Pro-C for the last few years since I figured it simpler to program than the Rainbird ESP 's. But several customers cannot get the Pro-C figured out and probably never will. So I replaced a Pro-C with a rainbird sst on some customers. I know this is not a professional grade model but at least the homeowner can operate it. I plan on using it on the right customers. The STP model is listed under the professional products but it does not have an outdoor model with a cabinet and looks cheap. The only problem with the SST is the WR-2 rain sensor will not hook up to it without using an outside transformer. I tried looking for the 24V wire but did not want to tear up anything by pulling off the faceplate. Anyone ever give these a look? Any suggestions on hooking up the WR-2 without using an outside transformer?