Xteink's Tiny E-Reader Clips to Your Phone

Xteink launched the X3, a 3.7-inch screen that magnetically attaches to iPhones and Android phones, for $79. The battery lasts 10–14 days of light reading. It uses e-ink technology, which consumes far less power than a phone screen. The tradeoff: it's much smaller than a dedicated e-reader, and charging requires a special cable.