Sharp EL-377WB Business Calculator, White 2.75 10-digit calculator features an extra-large 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, 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. Handheld calculator also includes automatic tax keys, percent key, square root key, four-key independent memory, automatic power down and more. Features "Extra-large, fixed LCD displays crisp digits to prevent reading errors" Durable keys are comfortably spaced for accurate data entry "Backspace key allows fast, simple corrections for time-saving use" "Twin-power operation ensures consistent, reliable use in any environment" "Also includes automatic tax keys, percent key and more" USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.