44 of 53Image
There is a speaker opening on the back. Notice the arrow pieces sticking up along the center of the back? These are where the silicone attaches to help keep it tight to the case back.
The silicone shell attaches to the back with some ports being protected with hinged plugs. Areas such as the camera are always available and open. There is no protection for the camera though.
Here is a shot showing where those arrow pieces hold the silicone in place.