I'm sorry, but I don't have this device. MHCOZY sells devices manufactured by various Chinese companies under their brand, so different two-channel relay boards may have different pairing procedures.
No problem, agreed so many different devices...
Finally figured out how to place this device in pairing mode. There are three buttons, starting on the power input side:
1 - Mode Switch,
2 - Manual Operation Relay one
3 - Manual Operation Relay two
Press and hold either Manual Operation Relay button for 8 seconds and the light will start flashing red - you are in pairing mode now. Ignore the flashing blue that starts around 3 seconds, as this is for pairing a RF remote control device. Mine actually was flashing blue and then red/blue, but finally settled on only flashing red. Don't expect the Mode Switch to do anything, as this is for programing the RF remote, this was my original mistake.
This device is also known as the YXMAN, MHCOZY and Huacaoe 2 Channel zigbee switch - all seem to be a rebrand of the Tuya TYZG-2001.
With some trial and error PLUS using this original suggestions in the thread, all working now with the Tuya drivers.
Happy dance!
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