Nextar MA791 用户手册

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页码 33
Connection and Downloading   
Connect to PC 
Plug the attached USB cable into your PC and connect the other end to the MP3 player. 
Press Play/ to switch the USB mode between MSC mode and MTP mode.   
Downloading files 
When you have connected the player to your PC, select the desired files then right-click and select Copy. 
You can now paste them into the player by right-clicking on the player and selecting Paste.