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Sinilink USB Switch
Model reference: XY-WFUSB
Sinilink USB

Available from:
Aliexpress.com
Aliexpress.com
Banggood.com


Manufacturer:
Alibaba.com

Flashed with:
Serial port

GPIO #Component
GPIO00 User
GPIO01 User
GPIO02 None
GPIO03 User
GPIO04 Button1
GPIO05 Relay1
GPIO09 None
GPIO10 None
GPIO12 None
GPIO13 None
GPIO14 Led1i
GPIO15 None
GPIO16 LedLink
FLAG None
Template
{"NAME":"XY-WFUSB","GPIO":[255,255,0,255,17,21,0,0,0,0,56,0,157],"FLAG":0,"BASE":18}

pinout

Useful video on flashing from Andreas Spiess at https://www.youtube.com/watch?v=lrHhn2AVzSA He makes a suggestion to use 52 rather than 56 in the template to change LED behaviour.

It is possible to use solid core 24 AWG wires to make the connection without needing to solder them to the Sinilink board, but they may need soldering to a connector for the USB to serial adapter.