Pro-Micro (Arduino Leonardo)

Pro Micro ATMEGA32U4 5V 16MHz (Arduino Leonardo Compatible)

Features: 

ATmega32U4 running at 5V/16MHz

Supported under Arduino IDE

4 x 10-bit ADC,

12 x Digital I/Os

Hardware Serial Connections

On-Board Micro-USB connector for programming and standard USB functions

If you're supplying unregulated power to the board (6-9V), be sure to connect to the "RAW" pin on not VCC.