Product Features of ER8000 Britannica Concise Encyclopedia: More than 25,000 entries prepared by the editors of Encyclopedia Britannica. It will satisfy your immediate need for information and lead you to the in-depth information of the 40 million words of the Encyclopedia Britannica. Concise Oxford English Dictionary: It contains over 240,000 words, phrases, and definitions, including 1,700 new words from the Concise Oxford English Dictionary. Concise Oxford Thesaurus: Over 333,000 alternative words providing over 4 million synonym links covering everyday vocabulary as well as more unusual and specialist words from the Concise Oxford Thesaurus. Oxford Concise Dictionary of Quotation: It contains over 9,000 quotations from more than 2,000 authors, and with both author names and quotations keywords searchable in the Oxford Concise Dictionary of Quotations. Spellchecker: 130,000 word phonetic spellchecker. Instant display of suggested words list while spell checking. Abbreviation Solver: Decodes over 10,000 abbreviations. Solve: 7 indispensable solvers to help you with crosswords, anagrams, abbreviations, letter changes, searching definitions, and encyclopedia search. Word Games: 11 great vocabulary-building word games to challenge your command of the English language. 3 skill level per game. Calculator & Converters: A full function calculator with memory & % is included, containing over 190 invaluable metric/imperial converters. Batteries: 2 x AAA