Beeping when the brightness in less than 100%

Hello there,
I found an issue with Chiwi Aerobook. For some reason there is very hard beeping, that disturbs me. It comes when the brightness is less that 100%, but even if I work with this brightness, I would fell discomfort and pain in the eyes. So please help me with this issue.
I ordered laptop on aliexpress and got it on Wednesday night. I would like to return it and get another one without issues or get my money back. Also I recorded a video in mp4, but unfortunately it is not supported here. Let me know if you would like to look at it.

If you want to return the laptop, you need to contact the seller on aliexpress or aliexpress customer support.
If the beeping comes not from the speakers you may have hardware problems.
Can you upload the video on youtube and share link to it?

Thanks for the quick response! I already contacted seller on Aliexpress, hope we will find a way to fix this.

Here you are - If you will have any idea how to fix this, please let me know. Thank you!

Yep, seem like hardware problem. Try to install new graphic driver, maybe something will change.

Thanks. Try to do it as soon as possible!