This is a game center prize from about 20 years ago, a cassette-shaped voice calculator. When the calculator gives an answer, the same melody plays as when a mystery is solved in a game♪ This item has been stored for a long time. I've thrown away the original box, so I'll include a box from a towel that was released around the same time. The box is larger than the game cassette. It's a little small to fit the calculator, but I will pack it in this box.