SOLAR & BATTERY DUAL POWER - Solar powered and standby AA battery make the desktop calculator keep working in low light conditions (AA battery not included). LCD DISPLAY - Extra large LCD display and tilted screen is so easy to read. LARGE BUTTON DESIGN - The electronic desk calculator adopts a scientific large button design, which conforms to human habits and is comfortable to touch. PRACTICAL 12 DIGITS CALCULATOR - The basic calculator is a general purpose solar calculator, 12 digits make it most useful for large calculations. It is suitable for any businessman, worker, teacher, student or anybody that needs make any sort of calculation from time to time. WARRANTY - We provide 1 year replacement and refund. If any quality problems, please contact us directly. We can also give you an excellent customer service.