12-digit calculator is perfect for desktop use either at home or in the office. Features an extra large LCD angled display. The smooth touch keyboard, huge 21mm display, and brushed metal faceplate, make it the optimal calculator for your desk. The loan wizard helps you effortlessly answer any loan question (simply input any three loan variable to compute the fourth, you also have the option to change payment periods per year). Also features 3-key independent memory, change sign key, backspace key, delta percent, automatic power down, and hybrid power (solar/battery backup). Power Source(s): Battery; Solar; Display Notation: Numeric; Number of Display Digits: 12; Display Characters x Display Lines: 12 x 1.