Power_Sources - Solar</br>Display_Notation - Numeric</br>Number_Of_Display_Digits - 8</br>Memory - 3-Key</br></br>Product Description</br></br>Well-spaced keys for quicker?? more accurate entries. Extra-large LCD for easy reading. Rounded corners for comfort while holding. Hard slide case protects calculator on the go. Dual solar/battery backup power for use in any lighting condition. Power Sources: Battery Solar Display Notation: Numeric Number of Display Digits: 8 Memory: 3-Key.</br><br/>http://www.amazon.com/gp/product/B001HAAK16