This device fits perfectly my Galaxy SII in place. High speed passages in stony paths have strong support or moved or taken my phone to bite the dust. Why only 4 stars you say? For this outfit flawless has a slight setback medal: the establishment of the phone is so so tight that a little paint peeling of the latter. But hey, it's an aging model that will have to be replaced, so in the meantime it is very good for my mountain bike tours.