all usb chargers should be 5v in the uk(not sure in other countrys but should still be the same), its also what usb runs on in a computer (5v rail..)so they all WILL work fine.. the only exception is where the put special circuitry in the PLUG. i would however stay away from dual usb chargers running from a usb slot if it isnt powered, there are many sites out there that explain why(google is your friend). sometimes they wont even work at the wall. why? well because the plug is giving you 5v and each device requires 5v duh, pretty simple. google is your friend.
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