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Cost/Sell/MarginCalculate the cost, selling price, or margin of profit on an item, given the other two values.
    
     
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Two-way power (Solar + Battery)Solar powered when light is sufficient, battery powered when light is insufficient.
    
     
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Function command signsA symbol (+, -, ×, ÷) on the display indicates the status of operation you are currently performing.
    
     
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Key rolloverKey operations are stored in a buffer, so nothing is lost even during high-speed input.
    
     
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Extra Large displayLarger display makes more data easier to read.