On the latest clones of Arduino models, The CH340 usb - serial converter chip has been used instead of Atmega 16u2 of the FTDI chip.

The popular usb to serial chip CH340 works well and its drivers is already installed on Win 8+ and Linux. Unfotunately if you use Win 7 or MAC OS X you need to install your drivers manually.

You can download your CH340 Driver to operate faster and more stabile on Win 7 and Win 8 by clicking here.  

To install CH340 driver on Win 7, click on the link, extract the files from the zip, go to CH341SER folder and open setup.exe.

If you use MAC, i wish this link will help you.  

After you did all of these, plug your board, choose the new COM port on the Arduino IDE - Serial port menu, than your Arduino is ready to be programmed  
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Features:

• Microcontroller: ATmega328
• Operating voltage: 5 V
• Supply voltage (recommended): 7-12 V
• Supply voltage (limits): 6-20 V
• Number of digital I/O pins: 14
• Number of PWM pins: 6
• Number of analog input pins: 8
• Max DC current for each I/O pins: 40 mA
• Flash memory: 32 kB (ATmega328, 0.5 kB is used by bootloader)
• SRAM: 2 kB (ATmega328)
• EEPROM: 1kB (ATmega328)
• Clock speed: 16 MHz