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• Suitable for the following models: BMW Tips, About AHD Style: Adjustment to AHD signal by way of display screen settings is required earlier than mounting the camera Go to Car settings >> Factory settings >> Reverse (picture) settings >> Select AHD If your monitor don&;t support AHD signal, please lower the white twine and alter to CVBS sign For high quality problems, please contact GreenYi customer support and provide applicable videos or pictures, we will take care of buyer problems inside 24 hours