| 摘要 |
A portable media player has controlling circuitry, a memory, and a non-rechargeable battery built into the media player's housing such that the battery cannot be removed, replaced, or detached without damaging the media player or otherwise rendering it inoperable. The portable media player may protect multimedia content, for example, by enabling the download of multimedia files or by playing any multimedia file according to a predefined rule. Multimedia files may be downloaded into the memory by using USB protocol and a connector that functions as a USB connector. An audio plug may be manipulated inside an output socket of the media player to turn the media player on and off and also to adjust the volume of the media player's output signal and to select a mode of operation, or any of these tasks may be exercised using control rings or touch switches.
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