| 摘要 |
<p>The plastic has an insulated plastic with plastic like ear canal pin (1) that is stored in an ear canal for allowing noisy level not to enter into the ear channel. An integrated acoustic pipe (2) is provided in the insulated plastic. A head plate (3) closes the system without impairing the functions. An integrated acoustic tubular inlet (4) is provided, and the system remains in closed state, and the insulation effect is not changed. Frequency of a filtering medium is 125 hertz to 8000 hertz. A connection assembly (5) connects the insulated plastic with a device behind an ear.</p> |
