| 摘要 |
<p>A USB(Universal Serial Bus) MP4 is provided to solve the employment problems by activating a video market or a music market. A memory card reader and a USB(Universal Serial Bus) terminal are added to an existing MP4(Moving Picture Experts Group 4), and a user inserts a memory into an MP3. The user is able to listen to music and watch video through the MP4. An internal memory is added to the MP4, and an MP3 music file can be sold through the establishment of the music site. A music disc can be reproduced through a memory.</p> |
