【SOLAR & BATTERY DUAL POWER】Solar powered and battery back-up make the desktop calculator keep working in low light conditions. 【12 DIGITS CALCULATOR】12 digits make the calculator most useful for large calculations. Suitable for any businessman worker teacher student or anybody that needs make any sort of calculation from time to time. 【LARGE DISPLAY】Extra-large LCD display and tilted screen of calculators is so easy and accurate screen reading. Liquid crystal display provides easy-to-read numbers for maximum viewing comfort. 【BIG BUTTON DESIGN】The calculators adopt scientific big button design in line with the use of human habits and comfortable for touch.