Change the USB chip, improve the download speed and stability of WIN7/WIN8
Note: Need to install CH341SER driver, here is the link: http://wch.cn/download/CH341SER_ZIP.html

Microcontroller Atmel ATmega328
Operating Voltage (logic level): 5V
Input Voltage (recommended): 7V ~ 12V
Input Voltage (limits): 6V ~ 20 V
Digital I/O Pins: 14 (of which 6 provide PWM output)
Analog Input Pins: 8
DC Current per I/O Pin: 40mA
Flash Memory: 32KB (ATmega328) (of which 2 KB used by bootloader)
SRAM: 2KB (ATmega328)
EEPROM: 1KB (ATmega328)
Clock Speed: 16MHz

Package included:

1 x Arduino Compatible Improved Version Nano V3.0