Features: Standard pin interface to achieve full compatibility with the pitch. 3.3V power supply using advanced chip (with the official expansion board power chip CC3000 same), so 3.3V board provided more accurate, so for ESP8266 as official cc3000 chip work as normal. It helps WiFi module power supply / service interface to facilitate developers to extend the power supply and maintenance. Onboard for ESP8266-12 stable industrial grade serial WiFi module, using an enhanced printed circuit board antenna, signal better. You can quickly switch DIP switch for ESP8266-12 industrial grade WiFi stable operation mode (such as operating mode and upgrade mode) module, integrated serial chip, quickly flashing the firmware. Built-in 5V to 3.3V TTL level converter to prevent high-pressure TTL level of the WiFi module damage. Onboard for ESP8266-12 stable industrial grade WiFi module with a metal block, immunity to interference. Onboard for ESP8266-12 standard pitch help to a stable industrial grade WiFi module all interfaces, enabling developers to easily develop deep. Use stackable design, it can continue to accumulate above the other modules, easy to use. Onboard four LED displays the status for ESP8266, namely PWR, DFU, AP, STA. Specification: Condition: 100% brand new Size: 68 * 52mm / 2.7 * 2in Package List: 1* Development Board 1、Standard pin interface to achieve full compatibility with the pitch. 2、3.3V power supply using advanced chip (with the official expansion board power chip CC3000 same), so 3.3V board provided more accurate, so for ESP8266 as official cc3000 chip work as normal. 3、It helps WiFi module power supply / service interface to facilitate developers to extend the power supply and maintenance. 4、Onboard for ESP8266?12 stable industrial grade serial WiFi module, using an enhanced printed circuit board antenna, signal better. 5、You can quickly switch DIP switch for ESP8266?12 industrial grade WiFi stable operation mode (such as operating mode and upgrade mode) module, integrated serial chip, quickly flashing the firmware.