Different Types of Kindles
The Amazon.com Kindle e-book reader was first introduced in 2007 and is currently available in two different models. The Kindle 2 has a diagonal screen size of six inches and can store up to 1,500 e-books, while the Kindle DX offers a diagonal screen size of 9.7 inches and the capacity to archive up to 3,500 titles.
The respective purchase price of each model ($189, $489) includes free, global 3G wireless broadband access, which enables users to purchase, download and swap titles from Amazon’s library of more than 620,000 e-books. The wireless capabilities of the device have recently been enhanced with Amazon’s so-called Whispersync technology, which allows Kindle owners to share their personal library of e-books across all electronic devices: PC, Mac, iPhone, Blackberry, Android and-or iPad. As part of this functionality, the page where the reader last left off on device A becomes the automatic start-off point when that same file is opened on device B.
The battery life of the Kindle 2 can extend to several weeks if the wireless capabilities are not used.
A display process dubbed eInk uses 16 different shades of gray-scale to clearly display reading materials, even in direct sunlight, at a resolution of 167 dpi and a pixel ratio of 600 X 800. Font sizes can be easily changed, there is a built-in dictionary and easy, convenient click-through access to Wikipedia.org.
Audio books are separately available for purchase and download via Amazon subsidiary Audible.com. They can be listened to on headphones or played on the device’s built-in speakers. Kindle e-readers registered to the same Amazon account can download additional copies of purchased e-book titles at no additional charge, up to a limit of six individual copies. Most of Amazon’s titles retail for the standard base price of $9.99 and can be purchased with a single click of the device keypad, provided a functional debit card or credit card is linked to the user’s account.
Owners of other e-readers such as the Barnes & Noble Nook or the Apple iPad should be aware that the Kindle uses a proprietary format that prevents its e-books from being read on other devices. In the spring of 2010. Amazon began noting which passages of e-books were highlighted most frequently by its Kindle users, raising privacy concerns among some watchdogs and consumer groups.