The D1 Mini is a WiFi development board featuring the ESP8266 ESP-12F module, designed for breadboard use. It supports programming via the Arduino IDE and NodeMCU. Equipped with an integrated USB Micro port and USB-to-serial (UART) converter, it allows seamless powering and coding by connecting directly to your computer using a USB Micro cable. (You will need to install a driver for your computer to recognise the on-board CH340G USB to serial converter. If you are using Codebender online you do not need to install a driver.) Specification Microcontroller ESP8266EX USB ↔ Serial Converter CH340G Digital I/O Pins 11 (see note 1 below) Analog Input Pins 1 Flash Memory 4MB Board Dimensions (not including pins) Length 34.2 mm Width 25.6 mm Height 7 mm Weight (including pins) 8.26 g What is Included 2 x ESP8266 ESP-12F Development Board D1 Mini Misc male/female headers