About installation and putting into use A. Need to find experienced profeional installation personnel or local shops engaged in modification and car maintenanceB. For self installation, the customer should be sure to install and aemble in strict accordance with the standard operation specificationsC. If you have any problems in the proce of using, please give us feedback in time, and we will reply within 24 hour About after sale A. All products enjoy a one - year warranty. If the product is defective, it can be returned to us within 60 days, and you can get a new oneB. This warranty does not cover any abuse, man-made damage, accidental damage, water inflow, improper operation and beyond the specified scope of useC. If for any reason you are not completely satisfied with your purchase, you can return and exchange the goods unconditionally. The return must have the original packaging and acceories, and the return freight shall be borne by the buyerD. We sincerely hope that you can leave us valuable comments and suggestions, sincerely look forward to your praise to five stars! If before giving negative comments, please communicate with us where the problem lies, so that we can solve the problem for you, and urge us to provide better service and continuous improvement