The Arduino Nano is a small, complete, breadboard-friendly sign based on the ATmega328. This board uses the same chip as the UNO, but comes in a different package. This board has no DC power jack, and is controlled with a Mini-USB cable.
 
Microcontroller 
ATmega328P 
Operating Voltage 
5V 
Input Voltage (recommended) 
7-12V 
Input Voltage (limits) 
6-20V 
Digital I / O Pins 
14 (of which 6 may give PWM output) 
Analog Input Pins 
8 
DC Current per I / O Pin 
40 mA 
DC Current for 3.3V Pin 
50 mA 
Flash Memory 
32 KB (ATmega328) 0.5 KB is used by the bootloader 
SRAM 
2 KB (ATmega328P) 
EEPROM 
1 KB (ATmega328P) 
Clock Speed 
16 MHz 
 
This arduino is a clone, which means that this sign was not built in the original factory. The only difference between original and clones is that these Arduinos are cheaper. All components (except CH340) and circuits are otherwise identical.