In view of the fact that several small earphones designed before are all planted on wearing comfort, this earphone puts wearing in the first place from the beginning. From the perspective of volume, ear-to-ear, and the choice of softness of silicone ear cap, all have high requirements. The ID comes out and tests the effect of 3D printing directly, and then constantly changes and tests, pulling up the employees one by one. On the premise of ensuring the basic sound quality, a 10mm moving coil horn is selected. The power and sound thrust have a foundation. After the sound cavity is reached, a suitable sound cavity is required, and the sound comes out. The length control of the sound cavity, the diameter, the selection of sound mixing paper, the simplicity of production and assembly, etc. are considered. Many factors and costs are considered. This is on the platform, under the condition of imperfect manpower and resources, there is really a lot to be busy with the design and production of a product. (Add some physical drawings, production process, finished products.)