Unfortunately, the device does not seem to have enough power. 2A are shown here, but when I have connected an iPod Touch and then a Nikon Coolpix S8100 slopes to break the power on so that the iPod adjusts the loading. :-(
Equipment defect I could not even check what is the reason. (Voltage or current)
But on the other (double) chargers I have no problems ...
Too Bad.