Ai-Thinker ESP8266 NodeMCU V2

The NodeMCU board can work on its own with Lua scripts. This board is a version of the nodemcu board with a CP2102 usb to serial converter instead of the CH340 chip and improved ESP-12E module. (instead of ESP-12)
More about the board can be read here. (It is very similar to this board)
The board is delivered without micro USB cable.
This board has the ESP-12E or ESP-12F module with 4MB flash memory.

In addition, just like any other ESP8266 module you can put the Arduino core on it so that you can use this NodeMCU board standalone with Arduino.
If you want to use the board as Arduino, start here . 

Specifications:

• Voltage range Vin pin: 5-10V DC (5V recommended because of heat generation)
• Maximum power consumption at 3.3V: 500mA

You can download the drivers here.