Something in my gameroom is beeping every day at 12:00PM (noon)

dingding...dingding

It's a soft, fairly quiet chime. I don't have anything TOO obscure in the area it's coming from. Sounds like maybe my handhelds section. Does anyone have ANY idea where it's coming from? Neogeo pockt? (has no batteries in it, but does have the watch battery still)

I'm never close enough to pinpoint it.