Please let me know your car model and year before you purchasing. Does your car have DSP or external amplifier was like Harmon Kardon. If so. Joying android car head unit will have no sound after you install it. There is a method can fix this problem. You could modify speaker wires to round these amplifiers and connect Joying radio speakers wires to your car speakers. and that will be ok.
If your factory car cd palyer was like the below pictures, your head unit will work perfectly.
If your car has a screen as the below picture, you will have to buy a extend BMW cable.
If your car has a screen as the below picture, you will have to buy a extend BMW cable.
If your original car plug as the below picture, you will also need to buy a extend BMW cable.
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