Very cool! Unfortunately, the paper (the hardware device this is using) is sold out, and M5 doesn't know if they're ever going to make it again: https://twitter.com/M5Stack/status/1376691939018350593

Would LOVE one of these devices, but unfortunately I don't know if I'll get to have one. Really hope to see more devices that are this form factor in the future. I loved my palm pilot way back when, and would love to be able to replace it.