Does it replace the screen in my car?
No. The original screen stays where it is; the module simply feeds the CarPlay image to it. You keep the joystick and the steering wheel controls.
Do I have to plug the phone in?
Not necessarily. The connection is wireless; USB is there as an alternative.
Can I play films or music from a USB stick?
Yes, the module has a USB player for music and video, alongside CarPlay and Android Auto.
Is the installation reversible?
Yes. It plugs into the LVDS connector, with no cuts in the loom. If you sell the car you take it out and everything is back to factory.