Power_Sources - Solar</br>Display_Notation - Numeric</br>Number_Of_Display_Digits - 8</br>Memory - 4-Key</br></br>Product Description</br></br>Dual solar/battery-powered for all lighting conditions. Large 15 mm digit size for good readability. Power Sources: Battery Solar Display Notation: Numeric Number of Display Digits: 8 Memory: 4-Key.</br><br/>http://www.amazon.com/gp/product/B006N4RLN6