Arduino Uno R3 is the clone one of the latest version of Arduino Uno with an on-board CH340 usb - serial converter chip. Even there are some little differences respect to original one, it is almost the same in terms of usage and software. This provides you a cheaper opportunitiy to get started with Arduino boards.

The microcontroller model of this board is the same as the original one (Atmega328). The only difference between microcontrollers is ther package. Original one has a DIP package but the clone one has SMD package microcontroller. 

Despite being a clone one, there are a pin group (4x GND, 2x 5 V, 2x 3.3 V, 1x RX/TX, 1x SCL/SDA) near to the crystal oscillator and there are external pin holes allow you to solder male headers on the board too.

Clone version of popular Arduino Uno R3 board. CH340 USB driver needs special driver, please check: http://www.microcontrols.org/arduino-uno-clone-ch340-ch341-chipset-usb-drivers/

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Arduino Uno SMD CH340 Driver Features

• Microcontroller: ATmega328P

• Operating voltage: 5V

• Input voltage (recommended): 7-12V

• Input voltage (limit values): 6-20V

• Digital I / O Pin 14 (6 of them provide PWM output)

• PWM Digital I / O Pinlar: 6

• Analog Input Pin: 6

• DC current per I / O Pin: 20 mA

• 3.3V Pin DC current: 50mA

• Flash Memory 32 KB (ATmega328P) which is used by the 0.5 KB bootloader

• SRAM: 2 KB (ATmega328P)

• EEPROM: 1 KB (ATmega328P)

• Clock Speed: 16 MHz

• Length: 68.6 mm

• Width: 53.4 mm

• Weight: 25 g