Best Cheap Audi A3 multimedia sat nav system with bluetooth usb sd

This is the Audi A3 multimedia sat nav,it has good performance but with low price,this sat nav system supports built-in GPS navigation system,it is like a multimedia system,it supports ipod iphone connect,so you can connect your ipod with it to share music with your friends,in addition,it supports bluetooth and bluetooth music,it allows to play music in your phone.other features:Support Rearview Camera. Automatically switch to rear camera and display rear image in the screen when reverse the car.USB and SD port. Support MP3/MP4/JPEG/WMA/DVD/CD/VCD/DIVX/MPEG etc.Dual zone function support.Navigating and Enjoying music at the same time.here is the product link:http://www.seicane.com/android-7-inch-car-dvd-player-for-audi-a3-touchscreen-gps-tv-ipod-3g-wifi-sia-9101 .