I unpacked the holder, inserted phone, immediately taken out everything again wrapped and sent directly back. The problem with this mount is the lock that holds the phone. It's kind of bracket, which one works against the cell phone. However, he goes around just not around the edge of the phone, so you have to push past him with some force. Here the bow scrapes over the silver frame of SGS2. From my old SGS I know how quickly scratched the paint of silver frame. That to me is an exclusion criterion, therefore return. I admit 2 instead of only one star because the holder otherwise makes a very strong impression. In particular, the suction cup is good. As a comparison, I have the support of my old SGS, which is much shakier and the suction cup falls off sometimes. for this was a spring folding mechanism on the bracket. that was better. the power supply is identical to what I have already. it has always worked well.