I saw a e-ink license place last week in LA. Anyone know what's up with that? Seems kind of hackable.
They're semicommon as a dealer add on to jack up car prices. IIRC the hardwired version is on the CAN bus and both versions let you set the slogan text from a list of preapproved phrases in the app over Bluetooth. It would be fun to reverse engineer, but not fun enough that I want to pay $400/year for it.