* STM32F303 ARM MCU

* USB-C connector

* ESD protection on the USB datalines

* Dual-channel speaker using the MCU's DAC

* Kailh's hot-swappable MX sockets and solderable Matias footprint

* Metal 2.5mm standoffs that accept #2-56 screws

* Per-switch RGB cut-outs for future projects (no LED support otherwise)

* Compatible with previous revision case styles

* 2x2u, 1x2u, Grid support along the bottom row

* PCB-mounted stabiliser footprints

Footprints for add-ons to expand functionality:

* 9x footprints for WS2812B RGB LEDs (COM-12667)

* Footprint for a 4-channel DIP switch (210-4ES)

* Footprint for a 2-pin JST-PH (PRT-09749)

* Footprint for a 4-pin Qwiic (I2C) JST-SH connector (PRT-14417) making it compatible with Sparkfun’s Qwiic system

* Footprint for a clickable (worked into the matrix) rotary encoder (COM-09117, et al)

* Footprint for a 6-pin male/female header (PRT-09015 or PRT-12590, et al)