>Does the device support justification?
Yes -- set by epub file (eg with Calibre), you can't change it on the device.
>Can I choose a font and override the standard font of
>the document, as seen on Cybook Opus?
No, but you can embed a font in an epub file to do this.
>Is it possible to set the size of the margins and the line spacings?
Yes -- set by epub file (eg with Calibre). It needs a right margin of 18pt or the page numbers will cover up the text.
>How many font sizes does this device have?
It has 3 zoom settings, it doesn't take much notice of font sizes set with Calibre.
>is it possible to turn it upside down,
No.
>How fast does it turn the pages?
Slowly. You have time to read a line of text before it changes, so you press the button when you reach the last line of that page.
>Is Text-to-speech really supported
No.
>Is there a possibility to lock the screen
Yes. But it will switch off after about an hour if you don't use it.
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