They didn't say (or I did not understand it well enough
). I just noticed the screen was scratched (well, it's a demo device anyway, but evidently it does seem possible to do it), you get a 33W charger for the 10000mAh battery, on which it runs for about 9 hours.
I think it is huge, and not my cup of tea anyway. 10"+ is more than enough for me. Certainly now new kobo's are coming up