Qwiic Pro Micro - USB-C (ATmega32U4)

The SparkFun Qwiic Pro Micro is a revision of the original Pro Micro and is, overall, functionally the same as the previous version. The board is the same size as the original Pro Micro but we added a few additional features by shrinking down some components on the board such as a reset button, Qwiic connector, USB-C, and castellated pads.

This tiny little board does all of the neat-o Arduino tricks that you're familiar with: nine channels of 10-bit ADC, five PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. It is running at 5V and 16MHz. There is a voltage regulator on board so it can accept voltage up to 6VDC. 

More information is available on the website of Sparkfun.