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I'd not use eInk for even mono. It's black, nearly white and 14 greys.
A 10" LCD tablet will do mono better and do colour. You can keep PSU connected.
Can't beat eInk for reading.
Also you either buy an eink reader that already runs Android, if you want android. I have a recent 7.8" Android eInk and it's poor for photos. Not bad for line art, etchings and similar illustrations.
The Sleep screen can't change without manually waking the ereader.
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