ESP8266 ESP-100 Serial WIFI Module Compatible With ESP-07 With External Antenna  Specification   More big Flash、 8M Flash bytes External Antenna New ESP8266 chip Novel processing design withe metal shielding shell、 half-hole design、 all I\/O can be used FCC CE certifications More strong function、 able to run LWIP protocol Support 3 modes: AP、 STA、 AP+STA Complete and brief AT instructions   Package included:   1 x ESP8266 ESP-100 Serial WIFI Module Compatible With ESP-07 With External Antenna