No eInk device can have a backlight, for the very simple reason that an eInk screen is opaque. (That's why many of the modern eInk devices are front-lit.) If you want a backlight, you need to be looking at LCD devices.
The best PDF reader around is, IMHO, the iPad. For the price of an M92 you could get a decent 2nd-hand or reconditioned iPad.
Last edited by HarryT; 04-02-2013 at 12:16 PM.
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