D1 Mini WiFi board built on ESP8266 chip.

WeMos D1 ESP Wroom 02 Board ESP8266 Mini WiFi Nodemcu Module 18650 Battery - Electromela Store

How to connect WeMos D1 Mini based on ESP-12F ESP8266 to ThingsBoard?

Boards — ESP8266 Arduino Core 3.1.2-21-ga348833 documentation

Using Arduino IDE for ESP8266 – WeMos D1 mini WiFi Projects.

Hello Wemos D1 Mini Clone – New Screwdriver

ESP8266 WiFi Module for Dummies : 20 Steps (with Pictures) - Instructables

1/5/10PCS WeMos D1 Mini ESP8266 WIFI Internet of Things Development Board Based ESP-8266 D1 Mini V4.0.0 NodeMCU Lua IOT Board - AliExpress

ESP8266 D1 Mini V2 ESP-12F WiFi Module - ProtoSupplies

WiFi ESP8266 Development Board WEMOS D1

Coding the WeMos D1 Mini using Arduino IDE - IoT Starters