A USB-C Pro Micro compatible microcontroller board. It has an AVR ATmega32u4 8-bit microcontroller which has an integrated USB controller. It has a USB-C port, 18 I/O pins and an integrated voltage regulator for 3V operation. This is the 5V 16Mhz version. Pin headers included. USB cable not included. This is on a purple PCB.
Find out more, including the pinout diagrams here on Deskthority.