ESP8266 is a highly integrated chip designed for the needs of a new connected world. *It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor. *NodeMCU has ESP-12 based serial WiFi integrated on board to provide GPIO, PWM, ADC, I2C and 1-WIRE resources at your fingertips? a built-in USB-TTL serial with super reliable industrial strength CH340 for superior stability on all supported platforms. *ESP8266 has powerful onboard processing and storage capabilities that allow it to be integrated with the sensors and other application specific devices through its GPIOs with minimal development up-front and minimal loading during runtime. 

Specifications:

• Upgraded to CH340 chip.
• This Development Kit is based on ESP8266, integrates GPIO, PWM, IIC, 1-Wire and ADC all in one board.
• NodeMCU is the fast leading edge low-cost technology to WiFi. Power your development in the fastest way combination with NodeMcu Firmware.
• It is an integrated unit with all available resources on board. It's very easy to complement your Arduino projects or any development board that has I/O pins available.
• Modern Internet development tools such as Node.js can take advantage of the NodeMCU with the built-in API to put your idea on the fast track immediately.