In a novel approach to portable reading, a Chinese technology company has introduced a unique gadget designed for book lovers who are always on the move. Xteink has unveiled the Xteink X4, a compact e-book reader that magnetically attaches to the back of modern iPhones, offering a secondary screen dedicated to digital texts.
What is the Xteink X4 E-Reader?
The Xteink X4 is a credit card-sized device that functions as a standalone e-book reader. Its core feature is a 4.3-inch e-ink display, similar to technology found in popular readers like the Amazon Kindle. Weighing a mere 74 grams, it is designed for portability. The key innovation is its magnetic attachment system, allowing it to snap onto the back of any iPhone that supports Qi2 or MagSafe technology, effectively turning your smartphone into a dual-screen device.
Specifications and Features
Under the hood, the X4 is powered by an ESP32 microcontroller with support for both Wi-Fi and Bluetooth connectivity. It comes with 128MB of RAM and includes a 32GB microSD card for storing a vast library of books and documents. The device is backed by a 650mAh battery, which Xteink claims can deliver an impressive up to 14 days of battery life with moderate use of one to three hours per day.
The reader supports common file formats including ePUB, TXT, BMP, and JPG. However, it operates differently from mainstream e-readers. It lacks a touchscreen and a backlight, relying instead on physical buttons on the side for navigation. This means reading in the dark requires an external light source. Users also have font flexibility, with two pre-installed options and the ability to install custom fonts.
Use Cases and Limitations
Beyond just reading books, Xteink suggests the X4 can be used as a display for boarding passes, membership cards, and calendars. The package includes the reader, the 32GB microSD card, a screen protector, and two magnetic stick-on rings.
Potential buyers should note significant limitations. The most notable is the absence of a built-in bookstore. Unlike Kindle or Kobo, users cannot access a vast integrated library. Instead, they must sideload DRM-free content or purchase books in compatible formats like EPUB. The small screen size also means more frequent page turns.
The Xteink X4 is available in black and white colour options. It was unveiled on December 6, 2025, and carries a price tag of $69, which roughly translates to ₹6,206 for Indian consumers. This positions it as an affordable, niche accessory for tech enthusiasts and avid readers seeking a minimalist, battery-efficient secondary screen for their iPhones.
