WIFI D1 mini - shield contact Relay
The set includes:
A very common Contact Relay to control the AC (light, home equipment, etc.) or DC load using WeMos / WiFi D1 mini PRO board. Control pin of Relay is connected to the D1 I/O port on the D1 mini. If you wish to use another I/O port, just cut off of the connection to D1 and solder it to another pad, as needed.