for Nano V3.0 ATmega328P Nano Board CH340 5V 16M Microcontroller Board, Compatible with Arduino Electronics Development Board Nano 328P Nano 3.0

Feature:
Microcontroller: ATmega328A
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 (I/O Pins)
Flash Memory：16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader
SRAM：2 KB (ATmega328)
EEPROM：1 KB (ATmega328)
Clock Speed：16 MHz
Support USB download and Power
Support for external 5V ~ 12V DC power supply
Support power supply by 9V battery
Support ISP download
CH340G Driver Download link : http://www.wch-ic.com/download/list.asp?id=126 OR http://www.5v.ru/ch340g.htm
IDE for arduino Download link : http://arduino.cc/en/Main/Software
Each of the 14 digital pins on the Nano can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions.
Some pins have specialized functions:
Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data.
These pins are connected to the corresponding pins of the CH340G USB chip.
The Nano is a small, complete, and breadboard-friendly board based on the ATmega328 ( Nano 3.x).
It has more or less the same functionality of the official for Arduino, 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.
Package Include :
4 X Nano Board

The Nano can be powered via the Mini-B USB connection, 7-12V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.
The nano has 8 analog inputs,each of which provide 10 bits of resolution.By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the analogReference function. Analog pins 6 and 7 cannot be used as digital pins. Additionally, some pins have specialized functionality
It is a smallest, complete and breadboard friendly board. It has everything that for Arduino has (electrically) with more analog input pins and on board +5V AREF jumper.
This board is using the chips ATmega328P and CH340, not FT232 as official for Arduino.
More Breadboard Space:Nano’s got the breadboard-ability of the Mini USB with smaller footprint than either, so users have more breadboard space. It’s got a pin layout that works well with the Mini or the Basic Stamp (TX, RX, ATN, GND ）on one top, power and ground on the other.