A c-level executive at my company (US, ~300 employees) has a low battery in their smoke detector. While this person is on calls the periodic beeping is extremely distracting and annoying to me. There have been multiple calls where it has been an issue and the first one was over a month ago. So this isn't the first time and they've had time to fix it. If it were the first time I'd ignore it as maybe it started before the call and they didn't have time to fix it.
Maybe they don't hear it, maybe it doesn't bother them, or maybe they don't think we can hear it.
Also, another possibility, maybe this isn't at their home. They work in a different office than me so maybe it is there. I just have been assuming it is their home.
My main concern is seeming like a nag. I tried gently mentioning in the chat on one of these calls if anyone hears a beeping and only one person replied and they said no. So maybe others cannot hear it. I don't want to seem like I'm being rude but I do want the beeps to stop.
How can I ask them to fix the beeping noise, politely while still being clear about how detrimental it is to my concentration?