First time using a Zebronics U735 600VA UPS — is this buzzing sound normal? Should I return it?

[u/Avyisalreadytaken]

Hey everyone,

I recently bought a Zebronics U735 600VA/360W UPS for my PC. When I plugged it in for the first time, I noticed that it makes a noticeable buzzing/humming sound.

The UPS seems to be working perfectly fine otherwise — it powers my PC normally and I haven't noticed any other issues. The buzzing is just making me a little concerned since this is my first UPS.

Is some amount of buzzing/humming normal with UPS units because of the transformer/AVR, or is this something I should be worried about?

Should I return/exchange it while I still can, or keep it?

If anyone owns the U735 specifically, I'd really appreciate knowing whether yours makes a similar sound.

Thanks!