That is not the issue. I can use the low voltage one, but that is less convenient as I have to bring the low voltage signal out of the Sonoff to drive it. The high voltage one can be driven direct from the Sonoff terminals. If the high voltage one were available at the low cost then that would be the most convenient.
In fact it seems the high voltage one is not available in the UK (not even on ebay direct from China) so I can't get it anyway.
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