The switch is all inside the garage, under a roof, water cannot enter by chance. The stains you see are not humidity, but mortar to fix a old work. Before sonoff, I had a usRiot used for 5 years, but with a very ugly app. In the description I forgot to mention that obviously the output of the sonoff was modified in clean contact. For the watertight box, however, it is a good idea. Thanks
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