Adafruit-ESP8266-SMT-Module-Breakout-Board-ESP-12-Adafruit-2471-P-The-Adafruit-HUZZAH-ESP8266-Wi Fi-Breakout-Boards-use-the-Internet-of-Things-chip-of-choice-the-ESP8266-running-at-80 M Hz-with-4 Mbytes-of-Flash-memory-9-x-GPIO-pins-&-1-x-analogue-input-Adafruit-have-produced-these-breadboard-friendly-breakouts-with-an-on-board-antenna-so-you-can-get-to-know-this-very-successful-chip-They-come-pre-programmed-with-Node MCU-Lua-firmware-which-lets-you-perform-complex-network-tasks-in-a-s