Before I explain, this was originally supposed to be posted to Yahoo! Answers but being that I don't have a phone anymore, I can't create an account. -.- This is why Yahoo sucks ass.

Anyway, I keep hearing a two-toned chime in my house. I know for a fact it's not directly in my ear.

Anyway, it goes on for about 1 minute in 5 second intervals before stopping for like 3 minutes. Then it goes on and on.
Sometimes it's soft, then it can get really loud. Sometimes it sounds like it's coming from right outside the window I'm currently seated next to.

Quite frankly, it's creeping me out. It kind of sounds like a cell phone warning you before the battery dies, but I don't have a cell phone.

Can someone please explain this?
Is it paranormal? Supernatural?

It's really eerie.

I once had a watch that kept this up for years. Could never turn the damn thing off cause it's 'reset' button was too small to fit anything in.
I ended up losing (and still hearing it), one day. It's stopped now though, but I'm assuming it's battery just finally gave out.

If you don't live alone ask if anyone else is hearing this noise? If not, you might be going crazy.