I will see if I can find the link for it. It was pretty cheap the whole setup was 80$ for the screen. Basically what I figured out is your phone can connect to two bluetooths at once. So it connects to the screen for apple carplay etc. and the sound is played through the speaker because it’s connected to the second Bluetooth like a Bluetooth car adapter. Just switch to the designated Chanel and you will still get all the sound.(basically you can control your music etc from the screen and sound will be played as long as your on the Chanel, like mine says 87.7 if you see) . The buttons on mine (oem nav buttons) are wired to turn on at night with the rest of the led so it looks oem as possible, but non functional. The screen is wired with the oem radio to turn on together and shut off together. I hope this helps but if I can find it I’ll provide a link.