Support 3 modes: , STA, + STAOn the basis of ESP-12, six new IO ports and SPI ports are added to the pins.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 , the PCB antenna has been tested in a professional laboratory and is perfectly matched.ESP8266-12F is an improved version of ESP8266-12, with improved peripheral circuits, higher impedance signal output is better, both stability and anti-interference have been greatly improved selecting users for ESP-12 , no matter whether the product is made or not, the improved version is fully compatible with the previous firmware pins. ESP-12 based on six io ports, spi port link, more convenient development and wider application.size:24x16mmMaterial:ABScolour:blackPackage Contents:5 * for wifi moduleOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.