@AniLi 

Hi,
Could you please confirm whether this issue only occurs when playing lullabies or white noise, or does the same static noise also happen during live view or playback recordings?
For troubleshooting the noise issue, we recommend referring to this FAQ for detailed steps: How to Reduce Noise on Tapo Cameras

If the problem persists, contact our customer service team and provide the results of the above troubleshooting steps.

Best Regards,