This is a PCB for a 45% keyboard. Supports ALPS and Cherry MX switches. No LEDs, only one SMT LED on the front bottom side. The supported layouts are this and this.
The controller MCU is STM32F042K6T7 - 32kB flash, 6kB RAM, DFU bootloader in ROM, LQFP-32 package. The BOOT0 pin for entering the bootloader on power up is brought out to a pushbutton on the bottom side of the PCB.