Pro Micro - 5V/16MHz - DEV-12640 - SparkFun Electronics
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Pro Micro ATmega32U4 3.3V 5V Module Board for Arduino – diymore
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Pro Micro DC 3.3V/5V ATMEGA32U4-AU Development Board – diymore
Pro Micro ATmega32U4 5V 16MHz Replace ATmega328 Arduino Pro Mini – diymore
Pro Micro (Micro-USB) - 5V/16MHz - Arduino-compatible ATmega32U4 – Keebio
