Looking for dLAN without high-pitched noise (young female, sensitive ears)- recommendations?

Hi guys,

I currently try to find a solution for my home office. Unfortunately, I can't use a LAN cable to speed up my internet for working from home. So I came across dLAN as a suitable option (other options are welcome as well if you know something! :) ). My dad has some of them (fritzbox, some older ones I assume) and I hear a super high pitched sound when it's connected to power.

I generally have a super sensitive hearing. I hear some alarm systems in the streets (nowadays less than some years ago), some animal scare-off systems, some microwaves etc. and it's super annoying. So I would like to find a device that is super quiet. Unfortunately, it is really difficult to find information about that (or is there a way??). I wouldn't even know which parameter I'd have to look for.

Therefore, I would really like to ask you for help/recommendations. Maybe you yourself are sensitive to high noises or know someone, and maybe you can recommend devices that meet my needs. I would be super grateful and highly appreciate some help of any kind!! Best wishes to you :)

(If it's important for accessibility of certain devices, I live in Germany.)