Second pair were a 7 and too big. Im one happy customer. No lag time while watching videos, love them. But, overall its super cute! I then spent the next 2 days at work listening to just about every genre I could think of, including songs I am very familiar with. The first time I turned it on it worked great. I took it to Disneyland this week and it kept our phones charged all day! 5 US, or 38 in Euro sizing, and I find the 7 US to fit fantastically in both length and width. I?ve had to get used to using it, but now that I have, I?ve experienced much less tension in my shoulders and I?m able to multitask much better while getting through those dozens of phone calls per hour. It could be that the pair I received was a lemon, who knows.