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Pro Micro Atmega32u4 Micro Usb Interface 5v 16mhz Board Module Repalce Atmega328 For Arduino For Leonardo R3 Pro Mini Nano V3.0 - Integrated Circuits - AliExpress
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Amazon.com: diymore Pro Micro 16MHz 5V with 2-Row Pins Header Module Board with ATmega32U4 : Electronics
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