Device is the XTEINK X3. Perfect pocket device for reading on my lunch breaks at work. Without the folding car, the device is about the size of a third of a deck of cards.
Here's a pic of the text (no spoilers)
These ones have a pretty powerful magnet so you can attach it to your phone using the metal ring sticker that comes with the e-reader.
I prefer having it separate personally. A 3D printed case would be a cool alternative though.