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Arduino Pro Micro ATmega32U4 5V 16MHz Pro Mini Leonardo Mini Interface Micro USB

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Pro Micro - 5V/16MHz - DEV-12640 - SparkFun Electronics

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Geekcreit® Pro Micro 5V 16M Mini Leonardo Microcontroller Development Board Geekcreit for Arduino - products that work with official Arduino boards

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Arduino Leonardo Board - operates at 5V.

AITRIP Pro Micro ATmega32U4 5V/16MHz Module Board, Replace with ATmega328 Pro Mini Compatible with Arduino with 2 Row pin Header 10pack : Industrial & Scientific