The EL-331FB Sharp 10 Digit Calculator can run off solar power or off a battery in low light and can be used for a wide range of business calculations such as tax and currency conversions. The sign change key makes profit or loss calculations very easy and the 3 digit punctuation on the display shows the thousands clearly making values easy to read off the screen.SPECIAL FEATURES:- 10 digit- Large LCD with punctuation- Cost/Sell/Margin and Tax functions- Twin power- User friendly and easy to readWhat's in the boxx1 Sharp EL331F 10 Digit Display Calculator