HiLetgo 2pcs ESP8266 NodeMCU LUA CP2102 ESP-12E Internet WiFi Development Board Open Source Serial Wireless Module Works Great with Arduino IDE/Micropython (Pack of 2PCS) Built-in Micro-USB, with flash and reset switches, easy to program Full I/O port and Wireless 802.11 supported, direct download no need to reset Arduino compatible, works great with the latest Arduino IDE/Mongoose IoT/Micropython Data download access to the website: http://www.nodemcu.com Firmware link: https://github.com/nodemcu/nodemcu-firmware