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This $30 DIY E Ink Reader Is a Pocket-Sized Library
(www.hackster.io)
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i think itd be useful for something simple and single use, like you can hang it on a wall near your door to see when the next bus or train is arriving. itd use barely any energy
for reading a book though, idk why he wouldnt just get something like the bigme highbreak. sure its more expensive but its a smartphone too