This is Casio's top-of-the-line calculator. Model name: S100 As shown in the second photo, the "0" button in the lower left corner is detached. It can be repaired by the manufacturer. (It will be a paid service as it is outside the warranty period.) Otherwise, the operation is normal. As it is a used item, there is some wear and tear, but there are no noticeable scratches, and it is in good condition. It comes with accessories such as the box and instruction manual.