Hey David,
didn’t know that PwnCNC also offers these now.
I know them from this URL: External IoT relay
(FAQ)
It switches loads on four NEMA 5-15 connectors with 120 V AC with total current max. 12 A . The triggering current of the control circuit is extremely small so that an Arduino or the buildbotics controller can control the relay directly.
Many people in this forum who have 120 V in their country use this relay which was propagated early in this forum, in this thread: