- Premium desktop calculator with loan functions. Featuring a smooth touch keyboard, huge 21 mm 12-digit display and brushed metal faceplate, making it the optimal calculator for your desk. Easy-to-use functions that are flawless for simple calculations, with the added benefit of the Victor's Loan Wizard to help you effortlessly answer any loan question. Input any three loan variables to compute the fourth. You also have the option to change payment periods per year. Power Source(s): Battery; Solar; Display Notation: Numeric; Number of Display Digits: 12; Display Characters x Display Lines: 12 x 1.