1. Microcontroller ATmega328 (SMD) – Interface CH340G
2. Operating Voltage: 5V
3. Input Voltage (recommended): 7-12V
4. Input Voltage (limits): 5-20V
5. Digital I / O Pins 14 (of which 6 provide PWM output)
6. Analog Input Pins: 6

Upgraded UNO R3, 100% Compatible to Arduino, works with the software at arduino.cc
Completely solves the traditional incompatible and instability of the UNO R3 to Win7 and Win8 system
Easy to use, with pins socket for inserting DuPont wire.
Support both 3.3V & 5V Power Supply and can meet different IO expansion requirements, including temperature humidity sensor, Xbee module, BT Bluetooth module, RF module, GPRS module, GPS module, LCD shield and so on.

This version is optimized in the original version , mainly for foreign customers on product quality and function under demanding conditions designed to ensure both consistent and compatible with the original , but also easy to use.