Product Features of ER9000 Oxford Dictionary of English: Over 355,000 words, phrases & definitions, 38,500 word origins, 11,000 encyclopedic entries & 550 usage notes. Oxford Thesaurus of English: Over 11 million synonym links, 316 thematic word lists, 300 "Choose the right word" notes & confusables. Oxford Dictionary of Quotations: Over 20,000 quotations from approx 3,500 authors. Fowler's Modern English Usage: Comprehensive and practical advice on grammar, syntax, style and choice of words. Oxford Dictionary of Modern Slang: A highly engaging guide to the most outspoken corner of our language. Spellchecker: 225,000 word phonetic spelling Oxford Dictionary of Abbreviations: 36,000 decodes for over 20,000 abbreviations. 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. "Smart Jump" between correct sense in Dictionary and Thesaurus. 14 Solvers: Crossword, anagram, cryptic, word viewer, word maker, phrase search, encyclopedic search, letter changer, slang search, homophones & homographs, dictionary of abbreviations and abbreviation search. 15 Word Games: with 3 levels to help build your vocabulary. Calculator: Plus over 190 metric/imperial and currency converters. Batteries: 2 x AAA