| 摘要 |
There is provided an arrangement, an accessory (200, 300), an audio device (202) and at least one earpiece unit (204A, 204B, 600, 700, 800). The accessory (200, 300) is suitable for an audio device (202) capable of providing an electrical audio signal. The accessory (200, 300) com-prises a first (208A, 208B) and a second (214, 214A, 214B) signal conveyers for conveying electrical audio signal driving audio transducers (206A, 206B) and electrical optic signal driving optical radiation sources (212A, 212B), respectively. The audio transducers (206A, 206B) and the optical radiation sources (212A, 212B) locate in the ear-piece unit (204A, 204B, 600, 700, 800).
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