Pro Micro Compatible Board - 5V/16MHz

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Leonardo R3 Development Board Pro Micro ATmega32U4 Module Compatible for Arduino – diymore

The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity

5pcs ATmega32U4 Pro Micro Controller Board for Arduino Pro Micro USB 5V/16Mhz Leonardo

Pro Micro ATmega32U4 for Leonardo 5V 16MHz Development Board Micro-Controller Board Compatible with Arduino IDE with Pin Header - AliExpress

Arduino-Compatible EDArduino Pro Micro, ATmega32u4, 5V 16MHz - ElectroDragon

Leonardo R3 Development Board Pro Micro ATmega32U4 Module Compatible for Arduino – diymore

BIT-C Pro Micro MCU with USB-C & DFU bootloader (ATmega32U4, 5V/16MHz, Black)

Pro Micro ATMEGA32U4 5V/16MHZ Compatible con Arduino

Pro Micro ATmega32U4 5V/16MHz Arduino Compatible - Duinolk

Pro Micro Module with ATmega32U4, 5V, 16MHz, Arduino compatible

Cytron Arduino Pro Micro Compatible w/ Pre-soldered Headers - RobotShop

KS0503 Keyestudio PRO MICRO 5V 16MHZ Development Board(Black and Eco-friendly) - Keyestudio Wiki

Arduino Micro Pro ATMEGA32U4 5V/16MHZ

Arduino Pro Micro Compatible - Pre-soldered Headers

10pcs Pro Micro/mini Usb 5v 16mhz Board Module For Arduino/leonardo Atmega32u4-au/mu Controller - Integrated Circuits - AliExpress