Ideal for everyday calculations, this desktop calculator adds up to a great office essential. Dual solar/battery power provides reliable functionality in all lighting conditions. Angled display prevents overhead glare and eyestrain. Easily solve other equations with the Square Root, /- Switch, and Percent keys. Power Source(s): Battery; Solar; Display Notation: Numeric; Number of Display Digits: 8; Display Characters x Display Lines: 8 x 1.