Display:9.7" diagonal E-Ink® electronic paper display, 1200 x 824 pixel resolution at 150 ppi, 16-level gray scale.Size (in inches):10.4" x 7.2" x 0.38".Weight:18.9 ounces.System requirements:None, because it doesn't require a computer.Storage:4GB internal (approximately 3.3GB available for user content).Battery Life:Read on a single charge for up to 4 days with wireless on. Turn wireless off and read for up to two weeks. Battery life will vary based on wireless usage, such as shopping the Kindle Store and downloading content. In low coverage areas or in 1xRTT only coverage, wireless usage will consume battery power more quickly.Charge Time:Fully charges in approximately 4 hours and supports charging from your computer via the included USB 2.0 cable.Connectivity:EVDO modem with fallback to 1xRTT; utilizes Amazon Whispernet to provide U.S wireless coverage via Sprint's 3G high-speed data network (check wireless coverage). See Wireless Terms and Conditions.USB Port:USB 2.0 (micro-USB connector) for connection to the Kindle DX power adapter or optionally to connect to a PC or Macintosh computer.Audio:3.5mm stereo audio jack, built-in stereo speakers.Content Formats Supported:Kindle (AZW), PDF, TXT, Audible (formats 4, Audible Enhanced (AAX)), MP3, unprotected MOBI, PRC natively; HTML, DOC, RTF, JPEG, GIF, PNG, BMP through conversion.Included Accessories:Power adapter, USB 2.0 cable, battery. Leather book cover sold separately.Documentation:Quick Start Guide (included in box) [PDF]; Kindle DX User's Guide (pre-installed on device) [PDF].Warranty and Service:1 year limited warranty and service included. Optional 2 year Extended Warranty sold separately.