Warm tips before purchasing: plese check if original car screen have a touch function. please check the main menu interface is same as our picture describe. please check if your car with OEM bluetooth for audio and call. if not ,please check whether the original car armrest box has an aux or USB port . Features: *Wired/Wireless Apple carplay *Wired/Wireless Android Auto *USB Player Functions: *Support IOS Airplay and Android mobile Auto-link You can use Mirror link to watch Phones, Youtube or other Videos on the Car screen.It will be more enjoyable. *Support OEM Camera and Aftermarket Camera CVBS Or AHD 720P/1080P aftermarket camera are supported to work with the carplay unit. HD reverse image will helpful while reversing. Please view the instrunction for aftermarket camera connection method details when you install it . *Support OEM Knob and Steering wheel Button The OEM Knob and steering wheel button is support to work after install the carplay unit. it is convenient while driving. Q&A: 1, Why will no have audio after installing Succesfully A: we have two way for sound output. Method 1 (via Aux ) : a. Access the Settings interface-------Factory Mode-----Phone Link setting -----Turn off the "Disable phone link audio" option. ------Reboot b.Disconnect the phone from the original car's Bluetooth connection. c.Choose the " Aux front " in your original media setting interface Method 2 ( via Oem BT ) : a. Access the Settings interface --------Factory Mode------Phone Link setting -----Open the option "Disable phone link audio". ------Reboot b. Then pair your smartphone with the original vehicle's Bluetooth. c. Select "Your phone Bluetooth" for phone calls and music sound sources in the original car media settings.