Mini/Type C/Micro USB Pro Micro ATMEGA32U4 5V/16MHZ module With the bootloader for arduino with 2 row pin header for arduino|Integrated Circuits| - AliExpress
I2C Shield for Arduino Micro with I2C Expansion Port - store.ncd.io
Fixing an Arduino Pro Micro: the USB Port Came Off !! : 17 Steps - Instructables
Diymore Pro Micro Board Atmega32u4 5v/16mhz Module Board With 2 Row Pin Header For Arduino Leonardo - Integrated Circuits - AliExpress
Arduino Micro met headers - ATmega32u4
Introduction to Arduino Pro Micro - The Engineering Projects