More on Amazon.com : http://www.amazon.com/gp/product/B005KU9EBG?tag=thefatkidin06-20

Sharp QS-2130 Compact Desktop Calculator 12-Digit LCD

Versatile twin-powered calculator with adding machine logic Solar powered with battery backup prevents memory loss and keeps calculator running in all lighting conditions
Easy-to-read display with automatic three-digit punctuation Auto power off after seven minutes
Power Sources Battery Solar Display Notation Numeric Number of Display Digits 12 Display Characters x Display Lines NA
12-Digit Display Batteries Calculator Calculators Handheld Non-Printing Portable Desktop SHARP Solar Mathematics Science Accounting Calculation Bookkeeping Schools Education