The Kindle wireless delivery system, Amazon Whispernet, uses the same nationwide high-speed data network (EVDO) as advanced cell phones. Kindle customers can wirelessly shop the Kindle Store, download or receive new content—all without a PC, Wi-Fi hot spot, or syncing. Amazon pays for the wireless connectivity for Kindle so there are no monthly wireless bills, data plans, or service commitments for customers.

Technical Details

Display: 6” diagonal E-Ink electronic paper display, 600 x 800 pixel resolution at 167 ppi, 4-level gray scale
Size (in inches): 7.5” x 5.3” x 0.7”
Weight: 10.3 ounces
System requirements:  None, because it doesn’t require a computer
Storage: 256MB internal (approximately 185MB available for user content); available SD memory card slot supports up to 4GB SD memory cards (SD memory card not included)
Battery Life: Leave wireless on and recharge every other day. Turn wireless off and read for a week or more before recharging. 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: Approximately 2 hours
Connectivity: EVDO modem with fallback to 1xRTT; utilizes Amazon Whispernet to provide U.S wireless coverage via Sprint’s high-speed data network (Check Wireless Coverage)
USB Port:  USB 2.0 (mini-B connector) to optionally connect to a PC or Macintosh computer
Audio: 3.5mm stereo audio jack, rear-mounted mono speaker
Content Formats Supported:  Kindle (AZW), TXT, Audible (formats 2, 3 and 4), MP3, natively; HTML, DOC, JPEG, GIF, PNG, BMP, MOBI, PRC through conversion
Included Accessories: Power adapter, USB 2.0 cable, book cover, rechargeable battery
Documentation: About Your Kindle Manual; Kindle User’s Guide pre-installed on device
Warranty and Service: 1 year limited warranty and service

http://www.amazon.com/Kindle-Amazons-Wireless-Reading-Device/dp/B000FI73MA/ref=kd_ln?ie=UTF8