The TTGO ESP8266 from LilyGO is a microcontroller based on an ESP8266 with a built-in 0.91 inch OLED display. The USB to serial converter makes it easy to program, even as an Arduino. The board has a micro USB connection with which it can be programmed and/or powered (micro USB cable not included). TTGO ESP8266 0.91 Inch OLED For Arduino For Nodemcu Development Board.
Power Supply Specifications
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*Note: The pins on the board are directly connected to the ESP8266 chip and are therefore only suitable for 3.3V signals.