1. Confirm that the host has audio output function.
2. Make a hole behind the main frame or the auxiliary driver's pillow to fix it.
3. When connecting the video, use the signal line to ground to avoid image formation interference.
4. It is better to connect the power cord of the headrest screen to the power cord with a larger power supply, so as to avoid the headrest flashing with the sound due to lack of power when the volume of the host is turned on.