The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x). It has more or less the same functionality as the Arduino Duemilanove or UNO but in a different package. It lacks only a DC power jack and works with a Mini-B USB cable instead of a standard one. Please get yourself a Mini-B USB cable separately.
Warranty Period: 12 months
Features
Specifications:
Microcontroller: Atmel ATmega328
Original Arduino Nano from Arduino.cc
Operating Voltage: 5 V
Input Voltage: 7-12 V
Digital I/O Pins: 22 (6 of which are PWM)
Analog Input Pins: 8
DC Current per I/O Pin: 40 mA
Flash Memory: 32 KB (ATmega328) of which 2 KB used by bootloader