Other related models are the fx-995ES (for the Japanese market), fx-991DE Plus (for the German market) and fx-115ES Plus (mainly for the US and Canadian market). The system used by the fx-991ES Plus is called "Natural V.P.A.M" instead of Natural Display. Its variant is the Casio fx-570ES Plus, with exactly the same features but powered by a single AAA-size battery. The fx-991ES is no longer manufactured and is succeeded by the fx-991ES Plus (for the international market) which has some improvements over the fx-991ES in inputting fractions and, displaying the results. The system is termed as "Natural Display". The Casio fx-991ES (introduced in 2004) is a solar and battery powered scientific calculator from Casio, whose special feature is the natural representation of mathematical expressions and formulas through a 96 × 31 dot matrix LCD display. Casio fx-991ES, with the "Natural Display" system
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