The WeMos D1 mini Pro is a small sign based on the ESP-8266EX WiFi controller. The module contains a micro USB port and CH341 USB-to-serial converter, making programming this module almost as easy as an Arduino. However, the strength of this module is in the stackable design and various modules with sensors and actuators. This module is supplied with headers.
The pro version has the standard WeMos D1 mini: 16M bytes flash, a LiPo connector (max 500mA), an I2C port, a PCB antenna and a connector for an external antenna, in addition, it is lighter in weight and still has the same format.