Mini Desk Type 12 digits Regular percentRegular percentage calculations. Solar & BatterySolar powered when light is sufficient, battery powered when light is insufficient. Key rolloverKey operations are stored in a buffer, so nothing is lost even during high-speed input. Extra Large displayLarger display makes more data easier to read. Plastic keysDesigned and engineered for easy operation. Mark-upAll the mark-up capabilities of an adding machine for simplified cost and profit calculations.