about this article The desktop calculator with two power sources: Solar power and Pole (one AAA Pole included) It allows simple use with large keys. 14-digit display, super-large screen, easy to read. Large calculator with large keys. The screen is slightly tilted, it is easily readable. Large and visible keys, essential functions. The main function of The perfect calculator for office, family, school, business, supermarkets... Product description Product size: 204mm x 158mm x 50mm 14 Digits . Dual power supply: solar energy and AAA batteries (including AAA Pole) All basic functions are fulfilled: Check, GT, MRC, M+, M-, Auto REPLAY, CORRECT, MU, + ,-, x, , % , CE, AC, etc. Package Included: 1*Calculator 1*User Manual Clear and Big Buttons This calculator has larger buttons than normal calculator.Large size gives you maximum comfort. The large screen is easy to read. Large backgrounds and large screens will most satisfy the needs of the elderly. It is more convenient to use and has a better using experience. Convenient for office workers Office workers do a lot of data processing work every day. Can't avoid data calculation, this calculator will be a good helper. Perfect for Students This calculator is a great learning tool. avoid using your phone and then distract your attention when you need something to help you calculate.