This electronic dictionary runs on a single AAA battery and offers approximately 400 hours of continuous display. Above all, it features 15 different content categories, including the comprehensive Japanese dictionary "Gendai Shin Kokugo Jiten," language-related dictionaries such as Kanji, English-Japanese, Japanese-English, and Katakana dictionaries, health-related content like the "Supplement Encyclopedia" that is of high interest to modern people, lifestyle content such as "Introduction to Weddings, Funerals, and Other Ceremonies," and business and travel-related content like the "Katakana Computer Terminology Dictionary" and "Wagamama Aruki Travel Conversation: 5 European Languages." It easily fits in your pocket, has a JIS-standard typewriter key layout for easy input, and depending on how you use it, it might be easier to handle and more useful than a smartphone. It is a used item, but it has almost no scratches and works without any problems. In addition to the main unit (with battery), there is an instruction manual (no box). 15 Content Breakdown: "Japanese: 6 Contents" In addition to the basic "Gendai Shin Kokugo Jiten," "Kanji Dictionary," and "Katakana Dictionary," it includes content to enrich your Japanese knowledge, such as "Idiom and Proverb Dictionary," "Four-Character Idiom Dictionary," and "National Dialect List Dictionary." "English: 2 Contents" Includes "Personal English-Japanese Dictionary" and "Personal Japanese-English Dictionary." "Health: 2 Contents" Includes the increasingly popular "Supplement Encyclopedia" and "Foods for Health Encyclopedia" which is useful for preventing lifestyle-related diseases. "Lifestyle: 3 Contents" Includes "Introduction to Weddings, Funerals, and Other Ceremonies," "Letter Writing Examples," and "Speech Examples," which are helpful for etiquette that you can't afford to fail at but often forget. "Business & Travel Conversation: 2 Contents" Includes the "Katakana Computer Terminology Dictionary," which allows you to easily look up computer-related terms in Katakana, and "Wagamama Aruki Travel Conversation: 5 European Languages," which covers English, Italian, French, Spanish, and German. Thank you.