Extra Large display Larger display makes more data easier to read. 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. Plastic keys Designed and engineered for easy operation. Durable metal Faceplate Tough cover stands up to rough treatment. Tax & exchange function Tax calculation and currency conversion functions. Tilt Display The degree of display can be adjusted freely. Profit margin percent " % " key gives quick access to prices and profits, and also delivers add-ons, discounts, ratios and increase/decrease values. Function command signs A symbol (+, -, ×, ÷) on the display indicates the status of operation you are currently performing.