Amazon Kindle is an e-book reader?an embedded system for reading electronic books (e-books)?launched in the United States by prominent online bookseller Amazon.com in November 2007. It uses an electronic paper display, reads the proprietary Kindle (AZW) format, and downloads content over Amazon Whispernet, which uses the Sprint EVDO network. The Kindle can be used without a computer. Whispernet is accessible through Kindle without any fee.What is the Amazon Whispernet wireless feature and how does it work?, Amazon.com Amazon does not sell the Kindle outside the United States as Whispernet only works in the U.S. On the release day, the Kindle Store had more than 88,000 digital titles available for download, but that number has steadily increased.Electronic Device Stirs Unease at BookExpo - NYTimes.com Amazon's first offering of the Kindle sold out in five and a half hours and the device remained out of stock until late April 2008. At launch, the device retailed for $399; Amazon subsequently lowered the price to $359.