ITEM NAME:CH340G NodeMcu Wireless WIFI Module Connector Board Replace ESP-12E ESP8266SEAU.On board there are usb-ttl serial converter ch340g, mini USB socket. DC 4 ~ 9v PowerIn pin VIN. WiFi modern ESP8266 + 32MB, the module is based on a wide range of exploration. programming, IIC and SPI communication, in a board WiFi wireless network and ADC.