1.The steering wheel key switch is not plug and play, please find a profeional to install; 2.The cruise control switch requires the support of the cruise control module on the car; 3.The function of each side control button requires the support of the in-car DVD; 4.The control of DISP, trip,and other instruments requires the support of high-configuration instruments,and at the same time needs to connect the line to the instrument; 5.The order of the lines may be different in different regions and needs to be adjusted according to the old lines at the bottom of the clock spring; If you encounter installation problems, please contact us as soon as poible. This Is Aftermarket Replacement Item but Not Genuine. 1.Please compare the shape with your car before making order,As we know, car versions will have some different in different countries.please ensure suitability carefully before purchase, thanks.2.Installation Instruction is NOT included. Profeional Installation Is Highly Recommend.If you have any questions, please contact customer service promptly. Thank you.3.Please allow 1-2mm error due to manual measurement.4.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightne of your monitor and light brightne.5.Due to the inability of the battery to pa customs security, the package sent does not contain the battery and requires the buyer to purchase it themselves. Please understand and thank you.6.To install this switch, it is required to have an Android system DVD on the vehicle. Otherwise, the button switch cannot be installed. Installation Procedure 1.Removing the DVD GPS player. 2.Connect ourmodel wire to the DVD player. 3.Wipe the steering wheel clearly , ensure can be sticked our's model. 4.Stick our product on the original steering wheel . 5.Pre and pre again, and fasten them securely. 6.Open the DVD player and go to setting the function on the steering wheel setting.