The internal memory of the Amazon Kindle can hold approximately 200 non-illustrated titles. Users can download content from Amazon in the proprietary Kindle format (AZW), or load unprotected Mobipocket (PRC, MOBI) or plain text content. Amazon offers an email-based service that will convert HTML, DOC (Microsoft Word), JPEG, GIF, PNG, and BMP documents to AZW. It also supports audio in the form of MP3s and Audible 2, 3, and 4 audiobooks, which must be transferred to the Kindle over USB or on an SD card.
Users can download content through the Kindle Store. The Kindle Store is accessed through Whispernet, over Sprint’s EVDO network, which Amazon provides free of charge. New releases and New York Times bestsellers are offered for approximately $10. Classics like Bleak House sell for around $1.99, with free samples available of the first chapter of each book.
Subscriptions to newspapers cost between $5.99 and $14.99 per month, magazines between $1.25 and $3.49 per month, and blogs for $0.99-$1.99 per month. Users can send documents to a conversion service which will send a Kindle-formatted file to the device directly for $0.10 or to a personal e-mail account for free. Users can transfer converted documents from a computer to the Kindle via a USB cable or an SD card for free. Access to Wikipedia is offered at no additional charge.