This is a CASIO programmable scientific calculator, the FX-502P. The items included are the calculator本体, the programming keyboard sheet, and the instruction manual. The instruction manual explains how to use the functions and programming. As it is old, the exterior shows wear and tear appropriate for its age. I have tested some functions and simple programs, and they are working normally. One minor issue is that the "8" key sometimes doesn't respond when lightly pressed, so you need to press it with more pressure. Recommended for collectors. Please understand that this is an old item before purchasing.