●Two Line Display, Desktop Calculator ●History Function - The calculated record can be retrieved and corrected. ( About 30 memories ) ●Turn the calculator upside down and remove the battery History will be deleted after three seconds. ●Size: 4.5×7 inch, 153g, Two way power ●Solar energy and battery (AAA 1.5V) ●Standard Function Desktop Business Calculator with LCD Display Screen for Home & Office Use