The above video is my review, i have it working great with my ownice c200 headunit. the usb seems to register that to the iPhone that it is a CarPlay device. the CarPlay UI apparently is stored and sent from the iPhone its self to the usb dongle and then sent to the android app. the app then sends touch and audio commands back to the usb dongle and then to the iPhone.
i can send photos of the internals of the device to any one who wants and a link to the APK.
I have about 20 of these in stock just email me at jacob.bloy at gmail.com I'm from australia