Portable Type 10 digits Tax calculation Automatic calculation of price plus tax, price less tax, discount, selling price, tax amount, discount amount, and margin amount. Time calculation Time calculation allows easy input and calculation of hour, minute, and second values. Two-way power (Solar + Battery) Solar powered when light is sufficient, battery powered when light is insufficient. Function command signs A symbol (+, -, ×, ÷) on the display indicates the status of operation you are currently performing. Key rollover Key operations are stored in a buffer, so nothing is lost even during high-speed input. Extra Large display Larger display makes more data easier to read. Plastic keys Designed 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.