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Amazon.com: KOOKYE 5PCS ProMicro ATmega32U4 5V/16MHz Module Board with 2 Row pin Header for Arduino Leonardo : Electronics
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SparkFun Qwiic Pro Micro - USB-C (ATmega32U4) - Compatible with Arduino development board 5V/16MHz microcontroller AP2112 3.3V Voltage Regulator Castellated PTH pin pads Reset button Maximum 6V input : Amazon.ca: Electronics
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