The sound is inspired by a dart board. The surface of the stereo is divided into different zones to represent different music genres, which is not only visually appealing, but also makes the interactive experience more intuitive and interesting. The darts are magnetically connected to the stereo, and by incorporating the design of a dartboard, the user can select the music genre by simply placing the darts, greatly simplifying the process of music selection. The realisation of a new physical interaction greatly changes the user's habit of choosing music, making it easier and more interesting.