Casio DJ-220D Plus calculator Desktop Basic Black, Silver

12 digits Regular percent: Regular percentage calculations. Recheck function: The recheck function allows confirmation of errors by sound when checking calculations. If the user presses an incorrect key when performing a second calculation to check calculation results, a buzzer sounds to alert the user of the error. Tax calculation: Automatic calculation of price plus tax, price less tax, discount, selling price, tax amount, discount amount, and margin amount. Two-way power: (Solar + Battery) Solar powered when light is sufficient, battery powered when light is insufficient.