Arduino Micro

The Arduino Micro is essentially a shrunk-down (1.9″ × 0.7″) version of the Arduino Leonardo: it is a microcontroller board based on the ATmega32U4

PRO Micro Atmega32u4 5V / 16MHz Mini MCU Leonardo Board for

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 with Headers [A000053]

A000053 Arduino, Arduino Micro Development Board, 771-7667

Arduino Micro — Arduino Official Store

ESP8266 Wifi with the Arduino Micro

I2C Shield for Arduino Micro with I2C Expansion Port - NCD Store

Pro Micro: Arduino Pinout - tinkerBOY

Pro Micro (Micro-USB) - 5V/16MHz - Arduino-compatible ATmega32U4

Micro Arduino Documentation