ESP8266-12 is an enhanced version of the ESP8266-12F, improve the peripheral circuit, the four laminates plate process, enhanced impedance matching, signal output is better, whether it is stable or anti jamming ability, PCB antenna after professional laboratory testing, perfect matching, after ROHS certification, have been greatly improved! For users before choosing ESP-12, even if the product has not been made, the enhanced version is fully compatible with the firmware before the ESP-12, based on the SPI and the new six IO port, mouth extraction, development is more convenient, more widely used!