Well, I didn't find the one I was looking for, but I found something similar. This one claims to be an "electronic chime, and it's Archer (radio shack) part # 273-071.
It LOOKS a lot like the one you showed, but it sounds different.

Close examination shows that this one definitely has a small speaker in it. And obviously there's also a bit of electronics to make it "chime". Yours is probably similar, it's just designed for a different noise.

Here's photos of the one I have:




Note that this one has 3 wires. Black and red are + and - in, and the white one "enables" the noise when pulled high.

It makes a kind of musical 2-tone "bing - bong" sound. I was going to record it for you, but my recording apparatus seems to be broken today.

Anyway, I'm sure that the one you have is similar... a little speaker with some small electronics to drive it. I still think I've got one like the one you showed around here somewhere, but I couldn't coax it to the top of the pile. If I find it I'll post a part #.



steve