Portable Type 14 digits Time calculationTime calculation allows easy input and calculation of hour, minute, and second values. 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. Plastic keysDesigned and engineered for easy operation. Profit margin percent” % ” key gives quick access to prices and profits, and also delivers add-ons, discounts, ratios and increase/decrease values. Metal FaceplateTough cover stands up to rough treatment.