I recently received an OpenSprinkler and OpenGarrage. Both are now setup and working well.
For the Sprinkler I selected the DC version and chose to have the Power Supply provided.
The Power Supply , is a US model with an AU to US converter. The converter is not great. The pins are thinner (1.18mm) than other plugs I have (1.6mm), and are not thick enough for the power point to hold them in place. So while plugged in, it is quite loose and has a tendency to spark as as it wobbles about (esp as the adapter holds it off the wall more).
This is not a problem for me as I have other adapters and some AU Power Supplies I can use.
I would not recommend anyone use the adapter. Might be worth trying to source a better one, or if you cant let the customer source their own adapter.