This is a dual energy calculator. Solar energy and backup batteries enable desktop calculators to work normally in low light conditions. The calculator's large LCD display and tilted screen make it easy and accurate to read the screen. Perfect for use in the office, school, or at home. It's ideal for anyone who needs to make quick and accurate calculations, including bank staff, financial workers, and data analysts. 4 7/32" W x 7 11/64" L