Aurora Calculator Euro Desktop Battery/ Solar-power 12 Digit 4 Key Memory 165x 228x 32mm Ref DT401.- +/- Change sign key.- Currency conversion.- Mark up key.- Adjustable tilt display.- Backspace correction.- 12 digits.- 4 Key memory.- Double zero key.- Battery powered: LR54 (included).- Rounding.- Wx Dx H: 165x 228x 32mm.- Selectable decimal point: F, 4, 2, 0, A.