Two-way power (Solar + Battery)Solar 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.Tax & exchange functionTax calculation and currency conversion functions.Profit margin percent" % " key gives quick access to prices and profits, and also delivers add-ons, discounts, ratios and increase/decrease values.Durable metal FaceplateTough cover stands up to rough treatment.