It is now possible to add an E Ink secondary display to Samsung's flagship smartphone without any modding whatsoever. Instead, the E Ink display can be connected via NFC and sits in the back of a silicone case to show favourite photos or even digital airline, concert or railway tickets, among other uses.https://www.notebookcheck.net/Samsung-Galaxy-S24-Ultra-gains-E-Ink-secondary-display-via-inventive-protective-case.847334.0.html
I thought the example they showed on laptops for customization was really cool, but it must be really expensive
This is amazing and it's color too.
It's been on Amazon for more than a week:
amazon.com/dp/B0D2DH56HZ