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Specifications 12 digits Regular percentRegular percentage calculations. 150 steps checkDisplays up to 150 previous calculation steps. Solar & BatterySolar powered when light is sufficient, battery powered when light is insufficient. Function command signsA symbol (+, -, ×, ÷) on the display indicates the status of operation you are currently performing. 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.