The PRS-505 Sony Reader is a portable e-book reader. It uses an electronic paper display developed by E Ink Corporation that has 170 dpi resolution, eight levels of grayscale, is viewable in direct sunlight, requires no power to maintain a static image, and is usable in portrait or landscape orientation. The reader can use an iTunes Store-like interface to purchase books from Sony eBook Store, as well as various third-party programs and stores. It also can display Adobe PDFs, ePub format, RTF and TXT personal documents, blogs & RSS newsfeeds (via third-party software and the USB cord), JPEGs, and Sony's