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The majority of dedicated reading devices use EInk screens which are like ink on paper, they are illuminated by outside light. So they work very well outside. At night, they need an external source of light and typically this needs to be a brighter source than for a paperback book (although with EInk you can increase the size of the text in low light).
The jetBook has a LCD screen, but it is also reflective (no back light) and so it works like EInk except that the refresh rate is much faster.
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