The reason for the sound:
The "click" sound is the sound made by the internal night vision device of the camera when switching. Generally, cameras with night vision functions need such a filter to help the device switch between night vision mode and daylight mode.
Every time the device is started, it will also make a "click" sound. This is the device's self-checking function, which is used to determine which mode the current light is suitable for.
How to prevent the camera from making a "click" sound:
If this sound is bothering you, please go to the left sidebar > Device settings > Night Vision Settings, and select "Always Turn On Night Vision" or "Turn Off Night Vision". The device will not make this sound again.