Large, 10 Digit Professional Large Pocket Calculator, Perfect For Business Professionals On The Go, Finished In A Modern White Design, Features An Extra Large LCD Display Durable Plastic Keys, Other Functions Include Automatic Tax Keys, Percent Key, Square Root Key, Backspace Key 4 Key Independent Memory Including Memory Plus, Memory Minus, Recall Memory Clear Memory, Extra Large Plus Key Automatic Power Down, Operates On Twin Power SolarBattery Backup