An overview of the Boox Palma 2 Pro, a $400 smartphone-sized e-ink reader running Android with Google Play support, cellular data, and stylus compatibility.

Unlike traditional e-readers, this one runs the Android operating system and supports Google Play for downloading apps. It weighs 175 grams and fits easily in a pocket or bag.

The screen has adjustable warm and cool lighting. The device also features a rear camera, built-in speaker, and a SIM card slot for mobile data. It is also compatible with a stylus for note-taking and file editing, and the battery life is said to last 5 to 7 days.

During use, a phenomenon occurs where text from the previous page remains faintly on the screen when turning pages, which requires the use of a refresh button.…