Features: Brand new and high quality Small and portable: The development board module is very small, which is very suitable for projects requiring compact design. Powerful processing power: ESP8266 chip is adopted, with 80MHz clock frequency and 4MB flash memory, which can meet the needs of most Internet of Things and embedded applications. WiFi connectivity: Support WiFi connection, so that devices can connect to the Internet wirelessly, and carry out remote control and data transmission. GPIO pins: there are 11 GPIO pins on the development board module, which can be used to connect sensors, actuators and other external devices. Power management: support Micro USB for power supply, and can also supply power through VCC pin. In addition, it also has a battery charging management function, which is convenient to use the battery as a power supply option. Specifications: Material:PCB Size:Approx.2.5x3.5cm/0.98x1.37inch Package Includes: 1x Development Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.