Large, 12 Digit Professional Large Desktop Calculator, Kick Stand Display Is Perfect For Business Professionals Home Or Office, Modern White Design, Features A Large LCD Display Large Durable Plastic Keys, CostSellMargin Keys Make For Quick Easy Profit Margin Calculations Simply Enter 2 Variables The Third Automatically Appears, Includes Grand Total Key, Double Zero Key, Backspace Key, Automatic Tax Keys, Percent Key, 4 Key Independent Memory, Extra Large Plus Key, Sign Change Automatic Power Down, Operates On Twin Power SolarBattery Backup