ESP8266-12F is an enhanced version of ESP8266-12. It has perfect peripheral circuits, four-layer board technology, enhanced impedance matching, and better signal output. Whether it is stability or anti-interference ability, the PCB antenna has been tested and matched by professional laboratories. ROHS certification has been greatly improved! For users who chose ESP-12 before, it doesn't matter even if they have already made a product. The enhanced version is fully compatible with the previous firmware. The pins are based on ESP-12 and six IO ports and SPI ports are added, making development more convenient and applications. More extensive!