Do I lose the factory system?
No. The original system stays fully working, and you switch between it and CarPlay whenever you want.
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.
Do I have to plug the phone in?
Not necessarily. The connection is wireless; USB is there as an alternative.
Does anything get cut in the wiring?
Nothing is cut. The module sits between the existing connectors, and when removed the car returns to its original state.