Headrest screen/second screen

 Joying android head unit cannot support video out directly.

For head unit without DVD player, you need to buy a digital media player and RCA cable to input and output. Here is the link of digital media player:

https://www.amazon.com/dp/B008NO9RRM 

There are 2 solutions to out video to second screen.

1. You can connect U disc with the multimedia box, then connect the AV cable with the second monitor, it will output the video or audio to the second monitor.
2. You can connect the AV cable with the head unit, then use another AV cable to connect the head unit with the second monitor, then the video or audio can play on the head unit and second monitor at the same time.

For head unit with DVD player, you need to use connect the head unit with RCA cable, then you can watch the video on the second screen.

More details, please check this video: https://youtu.be/R0E3diGxEBo