This NodeMCU ESP8266 WiFi Module features 4MB internal + 4MB (32Mbit) External Flash Memory, CH340 USB Chip, and comes with the Lua Script Firmware.
It is Open-source, Interactive, Programmable, Low cost, Simple, Smart, WiFi enabled.
We added extra 32MB Flash Memory for bigger projects, and the CH340G USB Chip for best compatibility with Windows, Mac OS and Linux computers.
Can be programmed using Arduino IDE
Event-driven API for network applications
10 GPIOs, PWM functionality, I2C and SPI communication, 1-Wire and 1 ADC all in one board
80MHz clock speed, 10 times faster than Atmel Atmega328
WiFi networking (access point, client or webserver)