Descriptions:

Arduino/Genuino Uno is a microcontroller board based on the ATmega328P (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.. You can tinker with your UNO without worring too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again. 

Technical Details:

Configuration:

Microcontroller                                                ATmega328P

Operating Voltage                                           5V

Input Voltage (recommended)                         7-12V

Input Voltage (limit)                                        6-20V

Digital I/O Pins                                                14 (of which 6 provide PWM output)

PWM Digital I/O Pins                                        6

Analog Input Pins                                            6

DC Current per I/O Pin                                   20 mA

DC Current for 3.3V Pin                                  50 mA

Flash Memory                                                32 KB (ATmega328P) of which 0.5 KB used by bootloader

SRAM                                                             2 KB (ATmega328P)

EEPROM                                                         1 KB (ATmega328P)

Clock Speed                                                    16 MHz

Length                                                            68.6 mm

Width                                                              53.4 mm

Installing drivers for the Arduino Uno with Windows7, Vista, or XP:

1. Plug in your board and wait for Windows to begin it's driver installation process. After a few moments, the process will fail, despite its best efforts
2. Click on the Start Menu, and open up the Control Panel.
3. While in the Control Panel, navigate to System and Security. Next, click on System. Once the System window is up, open the Device Manager.
4. Look under Other devices. You should see an open port named "Arduino UNO"
5. Right click on the "Arduino UNO" and choose the "Update Driver Software" option.
6. Next, choose the "Browse my computer for Driver software" option.
7. Finally, navigate to locate the "Drivers" folder (NOT the "FTDI USB Drivers" sub-directory) under the Arduino IDE folder "Arduino-1.0.x".
8. A diaglog box with warning will pop out, select "Install this driver software anyway".
9. Windows will finish up the driver installation from there.
10.