Eight-digit calculator features a hinged hard cover for extra protection when stored. Large LCD clearly shows each digit to help prevent reading errors. Twin-power operation runs on solar energy with a battery backup to deliver consistent reliable use in any environment. Handheld calculator also includes three-key independent memory square root key change sign key automatic power down and more. Sharp Calculators EL-243SB 8-Digit Pocket Calculator Gray Blue 1 Each (Quantity)