The Xteink X4 e-reader is on sale for $55.20 (down from $69), while the smaller X3 model costs $63.20 ($79 regular). Both are significantly compact, with magnetic mounts to stick them to compatible smartphones.

Despite their button-heavy interface, users appreciate the e-readers' excellent battery life and multiple ways to load content. The bundled software is less user-friendly, though it can be upgraded to CrossPoint Reader for a better experience.

The X3 offers an improved layout and broader compatibility with smaller smartphones, thanks to its magnetic mount. However, reliance on proprietary charging cables might frustrate some users.

While not everyone will embrace the e-readers' button-centric design, they offer a unique alternative for those seeking a more portable reading device.