Sunding Arduino Pro Micro ATmega32U4 5V/16MHz (Compatible) : : Industrial & Scientific

What is the Arduino Pro Micro? - Quora

Power of Arduino Leonardo in small form factor

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Type-c Mini Usb Pro Micro For Arduino Atmega32u4 5v/16mhz Module With 2 Row Pin Header For Leonardo Usb Interface Board - Integrated Circuits - AliExpress

CANADUINO Atmega32u4 Pro Micro - 5V 16MHz - Compatible with Arduino IDE : Electronics

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AITRIP Pro Micro ATmega32U4 5V/16MHz Module Board with 2 Row Pin Header Compatible with Arduino Leonardo Replace ATmega328 Pro Mini (1 Pcs)