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PRO Micro Atmega32u4 5V / 16MHz Mini MCU Leonardo Board for Arduino - China PRO Micro, Atmega | Made-in-China.com
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Amazon.com: HiLetgo 3pcs Pro Micro Atmega32U4 5V 16MHz Bootloadered IDE Micro USB Pro Micro Development Board Microcontroller Compatible to Arduino Pro Micro Serial Connection with Pin Header : Electronics
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