BenQ Joybee 180 - Manual (Page 61)

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4. The files in the selected directory are displayed in the
right panel. Click to select the file to be deleted. To
select more than one file, press and hold the Ctrl key on
the keyboard while selecting the files. To select all files,
click the first file, press and hold the Shift key on the
keyboard, and then click the last file.
5. Press the Delete key on the keyboard to delete all
selected files from the Joybee 180.
Note that Joybee 180 supports WMA DRM files as well. You
have to transfer the these files with Windows Media Player 9,
or your Joybee 180 won’t be able to recognize nor playback
them.
WMA DRM stands for Microsoft Windows Media Digital
Rights Management, which provides secure files distribution
and ease of use.
Please refer to relevant website below for information:
http://www.microsoft.com/windows/windowsmedia/drm/default.aspx