Large, easy-to-use keys are silent in operation & have separate 0 & 00 keys for convenience. Its low-reflection liquid crystal display tilts to give users an optimum view of their calculations, while a non-slip rubber base means it wont slide around on a desk. Machine is finished in a smooth imitation metal body for a professional look. Power Source(s): Battery; Solar; Display Notation: Numeric; Number of Display Digits: 12; Memory: 3-Key.