Waterproof and sound permeable membrane is a new type of polymer waterproof material, which uses sound permeable material to minimize the sound loss in the process of sound transmission. It can be protected from water, dust, dirt and impurities by sealing the shell and protecting the sensitive speaker, microphone and receiver. Its high air flow can prevent the internal pressure accumulation during the operation of the equipment, which reduces the risk of premature failure of the equipment and ensures that the equipment can always provide excellent sound effect throughout its life cycle. At the same time, it can also ensure high-quality sound transmission through its sound transmission materials.

Waterproof and breathable membrane, also known as polytetrafluoroethylene (ePTFE), is a synthetic polymer material which uses fluorine to replace all hydrogen atoms in polyethylene. This kind of material has the characteristics of acid resistance, alkali resistance and resistance to various organic solvents.