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available in two versions. One of these, the Kindle Wi-Fi, connects to the Internet exclusively via Wi-Fi networks. The other version, considered a replacement to the Kindle 2, includes both 3G and Wi-Fi connectivity.* Improved E ink "Pearl" high contrast display==== Kindle DX Graphite ====This is an odd duck, with some technology from the Kindle 2 and some from the Kindle 3. * no wifi* half the system memory (128MB) of the Kindle 3 (256 MB).* DXG runs the same firmware as Kindle 2With it, you can read e-books using Amazon's popular Kindle software, download Android apps and games using Amazon's Appstore, purchase music using Amazon's MP3 store, and watch videos using Amazon's video on-demand and download services. * 7-inch screen