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Regular Percent Regular percentage calculations. Two-Way Power (Solar + Battery) Solar powered when light is sufficient, battery powered when light is insufficient. 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. Durable Metal Faceplate Tough cover stands up to rough treatment. Mark-up All the mark-up capabilities of an adding machine for simplified cost and profit calculations.