Here in 3 words what I think. In fact, I have never seen a cable of this quality is simply amazing! For example, I have a Galaxy Note 3 and yesterday I was at 1% battery when I connected with this cable. I went to see an episode of my favorite series and I returned the phone was charged !!! Within an hour it's incredible. So even my wife just plug it when it is empty with its smartphone and needs to charge for express; I recommend it very highly.
