Sonoff MINI Extreme MINIR4 - Advanced Setup and Configuration; Adding eWeLink-Remote Sub-devices; Physical Installation in Mounting Box

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Add eWeLink-Remote Sub-devices
Install the MINI Extreme in the mounting box
Enter the Device Settings page on the eWeLink App, select "eWeLink-Remote sub-devices"
and tap "Add", then trigger the sub-device to add it successfully.
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