Why does the Xiaomi Smart Doorbell 3S whistle during voice calls?
For your reference, here is the information regarding this issue as below:
Because of the magnetic field interference, calls that are too close will have noise. Therefore, it is not recommended to place the mobile phone and the Xiaomi Smart Doorbell 3S in the same space during a call. Try to keep the mobile phone away from the doorbell for more than 10 meters. The echo whistling caused by a close call is a normal phenomenon. In addition, there will be a howl when two mobile phones are talking in the same space.
Because of the magnetic field interference, calls that are too close will have noise. Therefore, it is not recommended to place the mobile phone and the Xiaomi Smart Doorbell 3S in the same space during a call. Try to keep the mobile phone away from the doorbell for more than 10 meters. The echo whistling caused by a close call is a normal phenomenon. In addition, there will be a howl when two mobile phones are talking in the same space.
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