This is the portable device that contains the entire text of Wikipedia™, the Internet's largest general reference work. It provides up to 3,000,000 English entries covering commonly accessed topics such as The Beatles and Facebook, and more esoteric ones such as Dubin's Lives and Isocrates. Only slightly wider than a modern PDA, the device's 3 1/2" monochrome touch screen allows you to scroll up and down pages simply by dragging your finger; touching a link is analogous to clicking it with a mouse. The random button invokes completely unrelated topics, allowing you to browse with whimsy. All data is stored on the included 4 GB microSD card; updates are provided by either a quarterly update or a free Internet download using an SD card reader (sold below). Includes two AAA batteries. 4" L x 4" W x 3/4" H. (2 lbs.)