UNO R3 Atmega328p Development Board

Specification:
Digital I / O digital input / output terminal: 0 to 13.
Analog I / O Analog inputs / outputs: 0 to 5.
Support ISP download function.
Input voltage: No external power supply when connected to the computer USB, external power supply 5V ~ 9V DC voltage input.
Output voltage: 5V / 3.3V DC.
Using Atmel Atmega328 microprocessor controller.
Dimensions of shell: 79.5 x 64.5 x 21mm