Does this mean pictures have to be miss-scaled first not to show distorted on the picture frame?

Does this come with or use a DC adapter to plug into AC power, or just batteries (what size)?
Thanks

Product description says "shows 12 pictures at one time." Not clear about this. Most picture storage disks store at least 100, will this only show 12 of the 100, at a time? How do we display the rest if we want to have a showing?
Does this digital frame take memory stick duo?
Thank you!