White 4-Point Sharp El-334Wb Business Calculator. 12-digit calculator with a kickstand features an extra-large LCD that displays crisp, clear digits to prevent reading errors. Durable keys are appropriately spaced for fast, accurate data entry. Cost-sell-margin keys simplify profit margin calculations by allowing you to enter two variables and automatically receive the third variable. Backspace key allows you to make quick, single-digit corrections for time-saving use. Twin-power operation runs on solar energy with a battery backup to provide consistent, reliable performance in any environment. Desktop calculator also includes grand total key, double-zero key, automatic tax keys, four-key independent memory, automatic power down and more. "Extra-large, fixed LCD displays crisp digits to prevent reading errors" Durable keys are comfortably spaced for accurate data entry Cost-sell-margin keys allow quick profit margin calculations "Backspace key allows fast, simple corrections for time-saving use" "Also includes grand total key, double-zero key and more"