I've had this since I bought it, but I've never used it. I've confirmed that it works. There's a small scratch on the back of the calculator, but it was there when I bought it (the packaging has some scratches from storage). Please refrain from purchasing if you are looking for a brand new, store-bought item. Please refer to the images for the size and the instruction manual. I hope that those who like MUJI, or those who like simple things even if they don't like MUJI, will find this useful.