Xteink Launches $99 X4 Pro, a Small E-Reader That Attaches to Your Phone

Xteink launched the $99 X4 Pro e-reader on July 21, 2026. The 4.26-inch screen uses electronic ink — easy to read like paper — and now has touch controls and a built-in light, both absent from earlier models. Magnets on the back snap it onto compatible smartphones as a second screen. A memory card slot and open firmware plans round out the package.