The Casio JF120ECO Desktop Calculator is an eco-friendly desktop calculator packed full of practical features. Equipped with a casing made from recycled plastic and powered by eco-friendly solar energy combined with a mercury-free battery, it\'s an environmentally-conscious and reliable choice, ideal for any home office or workplace.The calculator incorporates a large, easy-to-view, 12-digit digital display and numerous handy functions, including currency conversion, tax and profit calculations, square root, 4 constants, 4 key memory, round up/down selector, +/- sign change and grand total keys, plus a backspace key to correct input errors without having to start all over again!Dual powered by solar with a battery back-up, it is highly reliable and uses very little energy. In addition, the automatic shutdown feature ensures your batteries will last and last.. 12 digit eco-friendly desktop calculator. Made from recycled plastic. Dual powered - solar and mercury-free battery. Auto shutdown to conserve energy. Large, angled, easy-to-view display. Non-stick plastic keys. Dimensions: H 26 x W 107 x L 173mm. 2-year manufacturer\'s warrantyFunctions:. Tax calculations. Currency conversions (4 rates). Profit calculations (cost, sell and margin). Backspace/correction key. 4 constants (k). Grand total (GT) key. Round up/down selector. Key rollover. Square root . Sign change key. Large + key. 00 key. 3 digit comma marker. 4 key memory. Decimal selector (0, 1, 2, 3, 4, ADD)