Wearefactorydirectsales,supportandretail.Ifyouhaveanyquestions,pleasecontactourcustomersatanytime.Wewilltryourbesttohelpyouanswerthem.Thankyou. Note: 1.The steering wheel key switch is not plug and play, please find a professional 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.Due to insufficient compatibility of DVD navigation, some buttons may not be able to learn 4.Please check if the spiral cable is a high configuration, and if it is a low configuration, please purchase a high configuration spiral cable 5.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 6.The order of lines in different regions may vary, and installation needs to be adjusted based on the old wiring harness on the vehicle 7.If you encounter any installation issues during the installation process, please