[EASY-TO-USE DESIGN] - With its large screen, this calculator is made for convenient and comfortable everyday use. Its tilted and angled display allows you to easily see your calculations without straining your eyes. [LARGE RESPONSIVE BUTTONS] - Its spacious button size ensures that your fingers are much less likely to hit the wrong number, all while typing with a satisfying feeling. [ROBUST BUILD] - Built with a sturdy and premium plastic body, the Office Calculator is constructed with everyday use in mind. It is convenient, powerful, and long lasting. [VERSATILE FUNCTIONS] - With its add, subtract, multiply, divide, percent, grand total and CE Button functionalities, this calculator's versatile nature allows it to be used in many occasions. [DUAL POWER SOURCES] - With the aid of its dual solar and battery power system, it is fully powered in any lit environment. The battery comes included with the calculator, ensuring quick and easy access right away. PLEASE NOTE: The calculator will turn itself off after about 6 minutes of being idle.