Kindle DX Review, KindleDX Wireless Reading Device is a Super Upgrade. Read the specifications and extensive customer reviews before buying your Kindle DX Wireless Reading Device. Slim: Just over 1/3 of an inch, as thin as most magazines. Carry Your Library: Holds up to 3,500 books, periodicals, and documents. Beautiful Large Display: 9.7″ diagonal e-ink screen reads like real paper; boasts 16 shades of gray for clear text and sharp images. Auto-Rotating Screen: Display auto-rotates from portrait to landscape as you turn the device so you can view full-width maps, graphs, tables, and Web pages, Built-In PDF Reader: Native PDF support allows you to carry and read all of your personal and professional documents on the go