out this item SOLAR BATTERY DUAL POWER: Solar powered and battery back-up make the desktop calculator keep working in low light conditions. Calculators work on solar power and have a 1.5v battery (AA included) as a battery back up and has an automatic power-off. LCD DISPLAY: Extra-large LCD display and tilted screen of display calculator is so easy and accurate screen reading. Liquid crystal display provides easy-to-read numbers for maximum viewing comfort. LARGE BUTTON DESIGN: Calculator-Simple adopts scientific big button design in line with the use of human habits and comfortable for touch. PRACTICAL 12 DIGITS CALCULATOR: The Basic Calculator is a general purpose solar calculator, 12 digits make it most useful for large calculations. Desk Calculator Large Display 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 for calculator 12 digits. If any quality problems, please contact us directly. We can also give you an excellent customer service team that can help you make the perfect shopping experience. Colour: black Product includes: 1pc Size: 120*105*45mm Notes Please allow 1-3cm error, due to manual measurement, please ensure you don't mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual colour of the item. Thank you for your support!