Encyclopaedia Britannica 3-Book Interactive Science Library: Dinosaurs, Reptiles, and Birds; Animals; Under the Sea is a captivating and effective learning and entertainment center for people of all ages. The set includes: 1 SD-X Interactive Reader, a battery-powered scanning pen that reads the words on the book pages and offers audio content such as facts, sound effects, and cross-references to other pages in the book. 3 fact-filled science books from the editors of Encyclopedia Britannica batteries that power the SD-X Interactive Reader, Encyclopaedia Britannica 3-Book Interactive Science Library: Dinosaurs, Reptiles, and Birds; Animals; Under the Sea covers topics that long have fascinated readers of all ages. Each hardcover, 80-page book is filled with factual text, and highly detailed photographs and illustrations. Here is a brief description of each of the books: Dinosaurs, Reptiles, and Birds. Includes data on how the mighty creatures of prehistoric times live on today in their crawling and flying ancestors. Includes data on invertebrates, amphibians, and mammals. Under the Sea includes information on ancient life, invertebrates, fish, amphibians, reptiles, and mammals. The SD-X Interactive Reader works only with six Encyclopaedia Britannica science books. The other three books (along with a Reader) are available as a set, and a library of all six books (along with a Reader) is available.