| 摘要 |
A headphone is provided. The headphone can include an enclosure having a surface. A continuous groove can be defined on the surface. The continuous groove can be shaped and dimensioned so that at least one perforation can be defined along the continuous groove. The continuous groove can be further shaped and dimensioned so as to be capable of carrying a detachable auxiliary portion. The at least one perforation can allow an air passage to be formed between the outside of the enclosure and a chamber defined within the enclosure. When the continuous groove carries the detachable auxiliary portion, air passage between the chamber and outside of the enclosure is blocked. |
