The document describes how an Amazon Kindle eReader works. It uses eInk technology which involves a top screen layer, a bottom layer, and millions of capsules between the layers containing black and white charged particles. Thousands of electrodes under the screen emit electrical charges that push the particles to the top of the capsules, allowing images to be displayed on the screen using only low power without backlighting. The user turns the Kindle on, navigates through books using buttons, and can view definitions of words by pressing buttons while reading.