VIEWSONIC VS12835 - Manual (Page 25)

Enjoy Life, Enjoy ViewSonic
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VII. eBook
On the main menu, highlight the "eBook" icon.
On the eBook menu, press to scroll and highlight your media
source, press button to select your eBook media source. Use the
Up/Down button to highlight your eBook file or folder and press the
Enter button to select the file or folder.
ViewSonic VPD400/VPD500