The Xteink X4 E-Ink Reader (opens in new tab)

I’ve had the Xteink X4 for a couple of months now, a £40 e-ink reader small enough to stick to the back of a phone. I’d seen a few posts about it (Khairul Selamat, Neil Brown, joelchrono, and moddedbear among them), so I got curious and ordered one.