A word of caution about iPhone 5S chargers
https://www.flickr.com/photos/125661418@N06/15242534155/
https://www.flickr.com/photos/125661418@N06/15055971937/
https://www.flickr.com/photos/125661418@N06/15219529876/
Fake chargers have been known to be high risk, and there have been deaths reported recently. But honestly, I expected higher quality from an original Apple product.
Just to add to the cringe factor, this happened on the toilet power outlet. Gladly, no one was harmed, despite the proximity the fingers to the actual short circuit as you can see on one of the photos. Also note that the mains pins are not damaged: the actual burst was on the USB side: who knows what transient went through that USB cable and into the user's hand.
If you've played with electronic circuits, you know carbon is a great conductor of electricity. Once a surface is carbonized, it spreads the short circuit around. The USB jack on this charger is now carbonized and should be considered electrically in contact with the mains pins.
Be very careful with any device charger. Never use your phone while it charges and never use another device while they're both charging as it may form a circuit. Just because it is 5 Volts USB it does not make it safe. There is a power line just 3 milimeters away from the USB jack inside this enclosure.
These switch-mode chargers are getting smaller and smaller and the physical shielding between 220VAC mains and the trusted USB output is literally just millimeters away. Distance means safety in electricity, and as great as these little charges look, I think safety's being compromised for aesthetics here.
Be extra careful with any charger, including original brand name chargers.