The subwoofer receives the signal from the car radio so it is independent of the other speakers.
It would be an advantage if your car radio has an output for a subwoofer, e.g. via cinch.
You can find the operating instructions online where this is described.
The following is included in the scope of delivery:
1 x subwoofer
4 x screws
4 x Small metal plate
1 x cable harness
1 x Remote control for bass volume (with cable)
1 x 15A fuse