This tiny pocket-friendly e-reader is packed with frustration and potential

I've used and reviewed dozens of e-readers over the years, but the 5-inch Kobo Mini remains my favorite for one simple reason: It was small. While it lacked useful features like screen lighting and page turn buttons, its size made it an e-reader I actually wanted to carry every day. The $69 Xteink X4 e-reader is even smaller than the Kobo Mini and E Ink smartphones like Boox Palma. It's satisfyingly pocketable but also frustratingly unintuitive and functionally limited out of the box. That could...