Although simple, but watch the clip on the medium.

But the black dot derived from the attachment of the cover on the support system.
It is too loose, the phone is ready to fall at any moment. Next time, I would put rubber bands or tape to hold it ...

Unless I do not know well the set, even after 15 minutes of searching, I do not recommend the use bike.

For cons, the cover is not bad (smartphone touch works), I could use it in another outlet.