ARDUINO NANO V. 3 is the open source smallest Embedded Development board based on Atmega328 SMD Package Microcontroller. It is a Surface mount Breadboard Friendly board integrated with Mini USB Port. DC Power Jack is not available on this Board, so power can be given through Mini USB Cable. It automatically sense and switch to the higher potential source of power, there is no need for the power select jumper. Specifications:-   Microcontroller                        Atmel ATmega328 SMD Package Operating Voltage (logic level)  5 V Input Voltage (recommended)  7-12 V Input Voltage (limits)               6-20 V Digital I/O Pins                        14 (of which 6 provide PWM output) Analog Input Pins                    8 DC Current per I/O Pin            40 mA Flash Memory                         32 KB (of which 2KB used by bootloader) SRAM                                     2 KB EEPROM                                 1 KB Clock Speed                           16 MHz Dimensions                            0.70” x 1.70”