This solar scientific calculator comes with a highly efficient solar panel that requires only 50 lux, works with any available light. Will never need batteries. 10 digit LCD + 2 digit exponent. 15 levels of parenthesis. 67 functions including all the preprogrammed functions of Large Display Scientific Calculator 830003 plus; binary, octal decimal, sexagesimal, and hexadecimal conversion, and standard deviation. Comes with a soft carrying pouch, full instructions and a button cell battery.