Before buying, I didn’t come across the mobi book format, as it turned out, I worried in vain - this is a fairly common format and I have never had to use the converter from FB2 to mobi. Has pros: Picture quality, ease of use, long battery life between charges (with active daily reading and the backlight on, about 2 weeks) Got cons: Have not found. I do not consider the presence of advertising on the screen to be a disadvantage.
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