As a transmission tool for music, headphones have changed from their heavy and clumsy appearance to their small and exquisite appearance, and now they are so small that they can be put directly into your pocket. From wired headphones to wireless neck-hanging headphones, and now to the true wireless Bluetooth headphones, all have experienced a long process of development. In this process, we have been pursuing the privacy that headphones bring to users, and try our best to let users enjoy their own music time after wearing headphones. However, sometimes music also needs to be restless and infect everyone who can hear it. This is why headphones exist and audio exists. Now, we can make the two into a unified whole, perhaps can call it the dialectical unity of music.