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 Solar/Battery Backup.