The Xteink X4 Pro is a highly portable, 4.3-inch e-reader designed to attach magnetically to some smartphones, offering an appealing alternative for readers who want a lightweight device rather than reading on a phone. Its touchscreen, home button and adjustable warm or cool front light improve on the earlier X4, but its small display and lack of an integrated ebook shop limit its broader usefulness.

Priced at $109, or $99 at the time of review, the 72-gram device is 5.95 mm thick and includes 16 GB of storage, expandable to 256 GB via microSD. Users must supply and manage EPUB files or send web articles through the companion app, which may be inconvenient for those accustomed to Kindle-style stores; the default settings show roughly a paragraph and a half per page and do not allow text-size changes without importing fonts or adding software.