Arduino Pro Micro microcontroller - based on ATmega32u4 processor.
The board has 18 digital inputs/outputs (of which 5 can be used as PWM outputs
and 4 as analog inputs), 16 MHz crystal oscillator, micro-USB connector.
The board contains everything you need to work with the microcontroller.
To run the Arduino Pro Micro, simply connect it to your computer with a micro USB cable.
The controller's form factor makes it easy to fit onto a breadboard.
The Micro Pro is similar to the Arduino Leonardo in that the ATmega32u4 has built-in USB connectivity
so no auxiliary processor is required. This allows Pro Micro to detect itself on the connected
computer as a mouse or keyboard in addition to a virtual (CDC) serial com port.
Features :
ATMega 32U4 controller
Supply voltage 5V
Frequency 16MHz
Digital I/O 18, of which 5 PWM, 2 Hardware UART. 4 analog inputs.
Power LED.
Micro USB plug
Size: 33x19 mm