MUJI Calculator Easy to use with a stand. [Reason for being a "defective item"] About half a year ago, coffee spilled on it, and the "0" button doesn't return properly. However, it responds normally when pressed, and the other buttons work as usual. I was using it normally until I recently replaced it. There are stains around the buttons and black marks on the back of the stand, as shown in photos 4 and 5. The box and instruction manual are not included; only the calculator itself. This is a used, defective item, so please purchase only if you understand that it is non-returnable and non-refundable (NCNR). Thank you for reading to the end.