
Send books to the display from an app on the device and change pages with the volume control.
Quote:
So if you want to catch up with a marathon session of "Fifty Shades of Grey" without caning your phone's battery or knackering your eyes, the PocketBook could be worth a look. Made by e-book-builder PocketBook, the case talks to an app on the phone, where you store your e-books. You take an e-book stored on your phone and zap it to the e-ink screen, turning pages with the volume key.
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Link:
CNet