【SOLAR & BATTERY DUAL POWER】Solar powered and battery back-up make the desktop calculator keep working in low light conditions. Eastpin calculators work on solar power and have a 1.5v battery (AA included) as a battery back up and has an automatic power-off.【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 Eastpin 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.【Risk-free Warranty】We provide ONE year replacement and refund for Eastpin calculators. If any quality problems, please contact us directly