Features 1、Safe Development: This ESP8266 development board is safe and reliable, and can be extended to various application scenarios. 2、Smart Expansion: Expanding the GPIO pins on a development board to two greatly facilitates users to reuse pins for large scale intelligent projects. 3、Better in Design: The expansion board adopts a double layer design with pins on both sides, providing good stability and high reliability. 4、Perfect Matching: Highly compatible for ESP8266 ESP-12E development board, for NODEMCU V2 GPIO expansion board. 5、Easy to Install: Light in weight and compact in size as well, the convenient installation can be quickly completed in minutes. Specification Item Type: ESP8266 Development Board Material: FR-4 material Board Size: Approx. 63 x 63mm / 2.48 x 2.48in Compatibility: For ESP8266 ESP-12E development board, for NODEMCU V2 GPIO expansion board. Package List 1 x ESP8266 Development Board