Eightdigit, minidesktop calculator features an extralarge LCD that displays crisp, clear digits to prevent reading errors Durable keys are appropriately spaced for fast, accurate data entry Backspace key allows you to make quick, singledigit corrections for timesaving use Twinpower operation runs on solar energy with a battery backup to deliver consistent, reliable performance in any environment Calculator also includes automatic tax keys, percent key, square root key, fourkey independent memory and more Professional calculator is perfect for business professionals at home or in the office