Kindle Keyboard Wireless Reading Device, Wi-Fi, 6&rdquo; Display, Graphite Amazon Kindle Keyboard 6-inch eBook Reader General Features: Graphite color Lightwight and thin design E Ink Pearl Technology 16-level grayscale 6-inch display 600 x 800 pixel resolution (167 ppi) USB 2.0 interface (micro-B connector) Integrated IEEE 802.11b/g/n (Wi-Fi) wireless 4 GB internal storage (3 GB accessible) Stores up to 3,500 books