Xteink X4 is a wallet-sized eReader That Snaps Onto Your Phone - Yanko Design

"You buy a Kindle or Kobo, load it with books, then leave it on a nightstand while your phone follows you everywhere. Reading apps on phones compete with notifications and social feeds, so you end up doomscrolling instead of finishing that novel you downloaded. Xteink's X4 tries to solve that by becoming a tiny, magnetic e‑ink sidekick that literally rides on the back of your phone, going wherever it goes."

"The Xteink X4 is an ultra-thin magnetic back eReader with a 4.3-inch e‑ink screen and a footprint closer to a deck of cards than a tablet. At 114 by 69 by 5.9 millimeters and just 74 grams, it snaps onto MagSafe or Qi2 compatible phones, or onto any handset using the included adhesive magnetic ring, turning your phone into a dual-screen reading machine without much extra bulk."

"The 220 ppi e‑ink display is not as sharp as a Paperwhite, but it is perfectly fine for text at this size. There is no touchscreen and no frontlight, just physical page turn buttons and a power key, so it behaves more like a tiny paperback than a gadget. You need ambient light to read, but in return, you get a very focused, distraction-free surface that does not glow or buzz at you."

"The internals are minimal: an ESP32 processor, 128 megabytes of RAM, and a bundled 32GB microSD card with support up to 512GB. The 650mAh battery lasts up to fourteen days with one to three hours of reading per day. It charges over USB-C and connects via 2.4GHz Wi‑Fi and Bluetooth for file transfers, so you can grab books wirelessly or just swap the microSD card."

Xteink X4 is an ultra-thin, 4.3-inch magnetic e‑ink back reader designed to attach to phones via MagSafe, Qi2, or an included adhesive ring. The 220 ppi display lacks a touchscreen and frontlight, using physical page buttons for a paper-like, distraction-free reading experience that requires ambient light. Internals include an ESP32, 128 MB RAM, and a bundled 32 GB microSD (expandable to 512 GB). The 650 mAh battery supports up to fourteen days of mixed use and charges over USB-C. Connectivity is via 2.4 GHz Wi‑Fi and Bluetooth. Supported file types are EPUB, TXT, JPG, and BMP, and all content must be sideloaded.

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