The new NodeMCU V3 is a breadboard friendly open-source ESP8266 development kit, armed with CH340 USB to TTL serial converter chip. Board is a fast leading edge low-cost wifi technology. Modern high-level mature LUA based technology. It is an integrated unit with all the available resources on board. For more details: https://1ohm.in/product/nodemcu-esp8266-ch340-wifi-iot-module/