In reply to Rene.

Re: "What does 'upgrade the power output' mean?" -- Now that I look at it, the back of my thingCHARGER shows it as 2.1A. That's equal to the output of an iPad charger. So, disregard my comment. I was thinking its output was 1A which is equal to the charger that ships with an iPhone. (A 2.1 amp charger will charge an iPhone faster than a 1 amp charger.)

Combine the above with me thinking I'd seen an option to upgrade the output during my final checkout, and that's what led to my comment.

Re: "Is it true they won’t fit into GFI kitchen outlets?" That's what someone has said on this comment thread.