Where can I get the -40C adapter box?

All recent adaptor boxes are OK at -40C. This means that all of the parts inside are rated to -40C, but we do not test them at cold temperatures.

Please note that the power supply is only rated to 0C. This rating allows the power supply manufacturer to use cheaper electrolytic capacitors that will freeze so failure is likely below 0C. Any replacement has to have low RF noise so as to not stop the rain sensor from working. RF filters can be built to solve this RF noise problem, however this is out of the scope of the support provided from us.