I bought a enjoyable and a useful tool. Better this way: “I bought a useful and enjoyable tool” The tool is “Music balloon”, .
If you use ordinary earphones, you cannot listen to other sounds. You may make your family angry because you can’t hear what they say. But you can listen to both music and your family by using “Music Balloon”.
In addition to usefulness, “Music Balloon” looks funny because it is chubby. This can give you a subject of conversation(like this journal)!
***Official web page (Exclusive Japanese)
This red and round thing is “Music balloon”.