Definition: In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.
Input: I purchased this for use during a UK trip, I live in the US. Yes, I needed an adapter to plug it into the outlet but that is not the issue. The USB ports do not supply a clean power for charging phones. This was tested on four separate iPhones and all yielded the same results, poor charging and an inability to use the phone while charging. If I used the power blocks supplied by Apple, it charged fine and the phone could be used while charging. My suggestion is to avoid this all together.

Purchased for use during UK trip, USB ports do not function properly.