A fully coded book in the DAISY (Digital Accessible Information System) format can have many levels of navigation, accessed by using the player’s keypad or buttons. For example, Level 1 could be chapters, Level 2 could be subheadings within a chapter, and Level 3 could be paragraphs. Using the appropriate keys, the user can navigate forward or backward through the book using these levels. The user can also go to a particular page, navigate by phrase (as defined by the book’s coding), or place a bookmark at a memorable passage or at the beginning of a section to be studied. Digital Talking Books can include both text and audio files.
Source - Digital Talking Book Players (Hardware) | American Foundation for the Blind (afb.org)
