| 摘要 |
An earpiece having at least one flanged extension is disclosed. The earpiece can be used to mitigate exposure to ambient sound. The earpiece can also be used to provide sound from a two-way radio or the like to a user's eardrum. Combinations of these two applications are possible. Thus, ambient sound can be attenuated while sound from a radio is enhanced. A controlled amount of ambient sound can be allowed to reach a user's eardrum. This may be desirable, for example, when it is necessary for a user to hear conversations or other comparatively lower lever sounds.
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