Why does the Redmi k30 speed commemorative edition feel a little vibration in the back when playing sound?

Since the vibration function is turned on, the solution is as follows:

1. First, find the settings on the open red rice mobile phone desktop, as shown in the figure below.

2. Then find "Sound and Vibration" in the settings, as shown in the figure below.

3. Then find "point vibrates on time" in sound and vibration, as shown in the figure below.

4. Click on it, and you can see that the current setting is "Medium". Change "moderate" to "off", and then click on the vibration effect to turn it off.