Hi Stefan,
not sure if this helps but I already replied to a similar question
Pin for 220v relay on arylic V3 pro - #2 by Nobu.
the manual online:
https://cdn.shopifycdn.net/s/files/1/0072/6899/1049/files/Up2stream_Pro_V3_Manual-en.pdf.pdf?v=1592389705
3.3V instead of 5v… but it’s switched on/of with the remote control.
Cheers
N.