This is an Uno R3 boards that is compatible with the Arduino Uno R3 board. Built on the Atmel ATmega328 microcontroller and USB-UART interface chip CH340G.
This board has similar functionality as the Arduino Uno (ATmega 168/328). It is stable and uses the original chips Atmel ATmega (16 MHz).
The board used the chip CH340G as UART-USB converter. You need need to install drivers for the CH340G chip to use the board.
Uno R3 - connects to the computer via micro USB cable (the same cable that used by all Android smartphones).
You can supply power to board through the Micro USB connector or DC-jack. The voltage regulator (LDO) can deal with incoming voltage from 6V to 12V DC. Output current for 5V - about 800mA, for 3.3V - about 180mA. This will provide a reliable power for most of your initial projects. We recommend power supply 7-9V.