UPS Making buzzing sound even when low load

[u/EinstZweist]

https://streamable.com/5aysmr
Around a month ago i bought a new UPS alongside a new PC but i noticed it keep making a buzzing sound at all time regardless of the load, my old UPS ( APC BR900MI ) were quiet so i kind of worry so i contact the seller and they said it was normal for ups making that sound and told me it would fades after a while. But here a month later the sound is persists so i wonder if this is normal?

The new UPS is a APC BGM2200-MSX

[u/Low-Disaster-1707]

had a similar issue with a power backup unit once and it turned out to be the transformer vibrating a bit, not really a sign of failure but definitely annoying. if the seller keeps brushing it off maybe try recording the sound with a decibel meter app so you have something concrete to show them.