Comment by SonderDesign

I'm one of the founders, the first unit used a prototype EPD from E Ink Holdings, a custom display with around $500k in NRE was developed for a Macbook size keyboard module. This single large display with a magnetic mechanism operating around the footprint meant the total unit cost in COGS was significantly lower than $100USD at scale. The entire mechanism was only a few mm in height including the display. The travel and tactile profile was designed to a butterfly switch mechanism spec.