?Customer Service?After receiving the package, please make sure the accessories are complete. Then follow the steps in the manual or description page to install it. If you have any questions, please feel free to contact us and we will help you solve the problem. ?Large HD Touchscreen?7 inch large touch screen car stereo supports 1080p HD video playback, provides you with awesome viewing experience.You can share your phone screen to this car radio screen via Mirror link. ?FM/ AUX/ Built-In Speaker?You can use FM by setting it to the same channel as your car radio.Just Plug the AUX into the fixed connector and it will be connected to the car radio.This item has a built-in speaker.High-quality sound effects let your hearing have a exellent experience. ?Bluetooth & Maps Navigation?With its built-in Bluetooth feature, this portable car stereo allows you to enjoy wirelessly streamed music as well as answer and make calls without any distractions while driving. Apple CarPlay and Android Auto supply navigation instincts through the 7-inch large screen, putting maps, directions and traffic information for you. (This car stereo does not support GPS on its own.). ?Mirror link?You can use this feature by means of wireless Bluetooth.This function is able to project the screen from your cell phone onto the 7inch large display, bringing a good audio-visual experience, driving is not boring!For Apple airplay only. ?Wireless Apple CarPlay & Android Auto?Turn on Bluetooth to connect your phone to Apple CarPlay or Android Auto, and you can call Siri and Google Assistant using voice control for hands-free calling,navigation,music playing, sending of messages, and much more essential features,allowing for a safer and more efficient driving experience.