Amazon announced the third-generation Kindle, later renamed "Kindle Keyboard", on July 28, 2010. Amazon began accepting pre-orders for the Kindle Keyboard as soon as it was announced and began shipping the devices on August 27, 2010. On August 25, Amazon announced that the Kindle Keyboard was the fastest-selling Kindle ever. While Amazon does not officially add numbers to the end of each Kindle denoting its generation, reviewers, customers and press companies often referred to this Kindle as the "K3" or the "Kindle 3". The Kindle Keyboard has a 6-inch screen with a resolution of 600×800 (167 PPI).
The Kindle Keyboard was available in two versions. One of these, the Kindle Wi-Fi, was initially priced at $139 and connects to the Internet via Wi-Fi networks. The other version, called the Kindle 3G, was priced at $189 and includes both 3G and Wi-Fi connectivity. The built-in free 3G connectivity uses the same wireless signals that cell phones use, allowing it to download and purchase content from any location with cell service. The Kindle Keyboard is available in two colors: classic white and graphite. Both versions use an E Ink "Pearl" display, which has a higher contrast than prior displays and a faster refresh rate than prior e-ink displays. However, it remains significantly slower than traditional LCDs. An ad-supported version, the "Kindle with Special Offers", was introduced on May 3, 2011, with a price $25 lower than the no-ad version, for $114. On July 13, 2011, Amazon announced that due to a sponsorship with AT&T, the price of the Kindle 3G with ads would be $139, $50 less than the Kindle 3G without ads.
The Kindle Keyboard is 0.5 inches shorter and 0.5 inches narrower than the Kindle 2. It supports additional fonts and international Unicode characters and has a Voice Guide feature with spoken menu navigation from the built-in speakers or audio jack. Internal memory is expanded to 4 GB, with approximately 3 GB available for user content. Battery life is advertised at up to two months of reading half an hour a day with the wireless turned off, which amounts to roughly 30 hours.
The Kindle Keyboard generally received good reviews after launch. Review Horizon describes the device as offering "the best reading experience in its class" while Engadget states, "In the standalone category, the Kindle is probably the one to beat".