It uses a Micro Pro and a rotary encoder: https://www.electrokit.com/en/product/rotationsenkoder-24-p-v-med-tryckknapp-utan-fasta-lagen/

Software is AM-Studios Button Box Arduino code.

Stickers are made by printing via a normal printer, one layer of transparent tejp, and a glue stick to attach them to the knob and plate.

4x3m plastik screws for the lid is needed.