Arduino Micro

The Micro is a microcontroller board based on the ATmega32U4 (datasheet), developed in conjunction with Adafruit. It has 20 digital input/output pins

Arduino Micro, ATmega32U4 MCU - With USB lead 5V/16MHz - Sound

Arduino Pro Micro connections pinouts.

Arduino Pro Micro 5V 16M

Arduino Leonardo Pro Micro Atmega32U4 5V/16Mhz Replace Pro Mini

Arduino Pro Micro – ScottoKeebs

Arduino Pro Micro Pinout, Power Supply and Brief Schematic – Gadget AU

Fixing an Arduino Pro Micro: the USB Port Came Off !! : 17 Steps

Pro Micro: Arduino Pinout - tinkerBOY

Arduino Micro - ProteShea

Arduino MICRO Reference Design, Microcontroller