Things buyers must know:

1.   The equipment must be connected to the correct power source. The acceptable voltage range of this system is 12V.    If the voltage is too high or too low, the system will not work properly. Only support 12V gasoline car, key ignition car installation.

2.    Installing this system requires some professional automotive electronics knowledge.Please read the product manual carefully.   Please pay attention to output signal cables must be connected to the correct signal according to the "+" or "-" on the product manual.  Wrong connections may cause short circuits or burnout of the product.

3.   All products have been strictly inspected before leaving the factory to ensure that they are complete and working properly.  If you have any problems after receiving the product, please contact us immediately.  We will give you the best solution.  Good communication is very necessary , we reject all disputes opened without communication.