Canon 8-Digit Portable Display Calculator measuring 3-1/2 in x 4 in x1 in is dual powered, features a large upright LCD and keytops. Chain multiplication and division, single live memory, square root, exponential and reciprocal calculations, percentage add-on/discount can be performed with this calculator. LCD display helps prevent overhead glare and eyestrain, while the large display makes numbers appear clear and crisp even in the dimmest lighting. The battery instantly takes over when the light source dims. Large keytops and key-top characters reduce the chance of miscalculations. Full range of functions include chain multiplication and division, single live memory, extraction of square root, exponential calculations, reciprocal calculations, percentage add-on/discount and overflow and error sign. Powerful solar cells provide all the energy you need under normal room lighting.