The Casio MS-8F 8 Digit Semi Desktop Calculator has an extra large display with easy-to read numbers. The calculator has an intuitive key layout and key shape that varies from row to row to allow for differences in finger movement. Shock absorbing structure is installed inside each key to create a cushion. Comfortable design allows prolonged use without getting tired owing to two-step touch configuration. The calculator is powered by solar power when light is sufficient, battery powered when light is insufficient.