There are 5 screws that hold the thin plastic layer (securing the speaker) to the other side of the enclosure.

Located inside, you can find headphone connector, wires to connect to the speaker, and the noise-cancelling microphone.

Small pieces of tape prevent wires from moving inside the enclosure, which will probably have to be removed (either to be re-adhered later or replaced with hot glue)

In the middle is a black sticker, hiding a single screw that makes a structural connection to the headphone frame through the "accoustic refulex/comfort chamber" (It's red on this model - Im not entirely sure of its main purpose)