You'd then download your texts into a computer.
I can't recall the name. I think it ran on regular alkaline AA cells. It attracted a bit of a cult following.
Edit: I think I must be thinking of the Alphasmart line - with products from 1993-2013:
https://en.wikipedia.org/wiki/AlphaSmart
Back before that, journalists used battery powered versions of the TRS-80 and even a modem to upload their texts to their news magazine.
A modern take is: