It is 100% compatible to Arduino Uno R3, but better.

This version is optimized in the original version to ensure consistent and compatible with the original, but also easy to use.
Compatible with win7 and win8 .
Increase the pin socket, to facilitate the use of DuPont line.
Replaced 16u2 By CH340.
Digital I/O Digital inputs/outputs: 013.
Analog I/O Analog input/output: 05.
Support ISP download function.
The input voltage:no external power supply when connected to the computer USB, external power supply: 5V 9V DC.
Output voltage: 3.3 V and 5 V DC voltage output.
Using Atmel Atmega328 micro controller.

Download link.
Arduino IDE:http://arduino.cc/en/Main/Software
USB chip driver:http://www.arduined.eu/ch340-windows-8-driver-download/

Package includes
1 x DCCduino Uno R3

Specs: