ESP8266-12E Is an enhanced version ESP8266-12 , improve the external circuit, enhanced impedance signal output is better, whether it is stable or anti-jamming capability , have been greatly improved ! Before selecting a user for ESP-12 's , it does not matter even if the product has been made , enhanced version is fully compatible with previous firmware pin has added the ESP-12 on the basis of six IO ports , SPI mouth leads , develop more convenient, application more extensive !