This was a replacement/upgrade since the original failed after 11 years of service -- very good. However, I found that the installation instructions were insufficient in describing the steps. I needed to phone your support line 4 times to get the installation complete; and I'm an electrical engineer. The power input terminals were not clearly identified which could cause the power not to be connected to the correct terminals if the user did not understand "load". I suggest that you change the wording to ensure that the incoming power & ground wires are explicitly connected across the "Load" terminals. Secondly, once power is applied, the GCFI red blinking light required a power reset from the breaker box; but there was no definition of the cause of the red blinking light until I called the support line again. Once all that was done, then the time-of-day had to be reset several times, since it was not picked-up from the network connection. The product is great; your instruction manual needs some work...