UNO Expansion Board ATmega328P Nano V3 Improved Version With USB ForDescription UNO Expansion BoardThe extension board specifically for the NANO welding on two rows of pins can be used in the duemilanove 2009 UNO R1ATmega328P Nano V3 Improved VersionChange the USB chip improve the download speed and stability of WIN7 WIN8Note Need to install CH341SER driver here is the link http wch cn download CH341SER ZIP htmlMicrocontroller ATmega328Operating Voltage logic level 5VInput Voltage recommended 7V 12VInput Voltage limits 6V 20 VDigital I O Pins 14 of which 6 provide PWM output Analog Input Pins 8DC Current per I O Pin 40mAFlash Memory 32KB ATmega328 of which 2 KB used by bootloader SRAM 2KB ATmega328 EEPROM 1KB ATmega328 Clock Speed 16MHzPackage included 1 x 328P Multifunction Expansion Board V3 01 x Compatible Improved Version Nano V3 0 with USB cable