I would think this calculator has a don't sell after this date printed somewhere like spoiled food
14 December 2014
Summary: since the batteries were dead upon arrival I wish I could give this Zero Stars. I don't relish pushing keys in vain, nor do I appreciate buying batteries for what was supposed to be a working calculator.
Summary: I use one of these as a desk calculator, and it does pretty much everything one would want from a calculator before reaching for the PC. Very good value for money and an excellent display, large and sharp. For science and engineering, student or professional, highly recommended.
Summary: I am very happy with my newly-purchased EL-506 Sharp scientific calculator. Compared to the more expensive (and identical-sized) TI 30X IIS, the very important First-function keys on the Sharp EL-506 are: "Exp" "RCL" STO" "M+" even "X^3" . . .