ESP-12 ESP8266 WeMos D1 Mini WIFI Development Board 3dBI 2.4G SMA Antenna UK
Open Tools → Board: xxx → Boards Manager and install esp8266 by ESP8266. Type: Extension cable, 3DBI Gain Antenna. 1PC 3DBI Gain Antenna. This is D1 mini, it is a mini WIFI board based on ESP-8266EX.