1.Built-in TCP / IP protocol stack, you can configure a socket.
2.Real serial WiFi, program without any configuration.
3.Can be used as stand-alone expansion board Uno use, pin all leads.
4.Based on WiFi Web Server configuration parameters and serial port parameters.
5.WiFi using industrial-grade chips ESP8266, modules for the ESP-13 with metal shield, anti-jamming.
6.Can be used as an independent ESP8266 development board, download the official AT commands firmware, NodeMCU open source firmware.
7.Standard pin-compatible Uno, Mega2560 and other control board,UNO connection with the use of a voltage converter chip, so 3.3V and 5V are compatible.
8.Serial port DIP switch with dual control, so the expansion board can be used alone as an Uno expansion boards, it can also be used as ESP8266 expansion board use.