Intuitive key layout and key shape that varies from row to row to allow for differences in finger movement. Outstanding visibility supports error-free, accurate calculation work. 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. Round shape body, that also slightly bulges on the back, produces a comfortable feeling when taken in hand. Special panel shape allows to easily place your hands and concentrate on calculations.