The audio-visual control is to control the vibration of the device according to the sound frequency of other APP playing videos or music. Different playing contents will cause different vibration effects.

Steps for usage:

1. Open the Meidong APP to connect to the device;
2. Enter the setting page and turn on "Background Control";
3. Open "Video Control", and then exit the APP to the system background;
4. Use the video software to play the video, the device will vibrate with the frequency of the video sound.