Aurora Semi-Desktop Calculator - DT398. Professional, dual powered calculator with a durable metal facia, hard keys, decimal point selector, round up key, mark up key, 3 memory keys and auto power off. 12 digits 3 Key memory Large clear tilted display Plus/minus change sign key Mark up key Backspace correction key Selectable decimal point: F, 4, 3, 2, 0, A Rounding Double zero key Solid hard-wearing metal front Solar/battery powered: LR54 (included) WxDxH: 103x138x28mm