I bought this for travel in the UK, I live in the US. Yes, I needed an adapter to plug it into an outlet, but that's not a problem. USB ports do not provide clean power for charging phones. This was tested on four different iPhones and they all gave the same results: poor charging and the phone cannot be used while charging. When I used Apple supplied power adapters, it charged well and the phone could be used while charging. My suggestion is to avoid all of these together.
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