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Sinilink USB Switch Module
Model reference: XY-WFUSB
Sinilink USB

Available from:
Aliexpress.com
Amazon.com
Banggood.com
Amazon.de

Manufacturer:
Alibaba.com

Install method:
USB to Serial

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 (old version)
{"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

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. Alternatively, you can strip some Cat5e cable, which has the perfect diameter to fit in this board without soldering.

If you use the Sinilink WiFi-USB with PWM-compatible devices such as LED lights or a fan, you can set GPIO05 to PWM instead of Relay, to control the brightness or rotation speed of the device you plug in.