I did say this was the weirdest mystery ever... On Monday I wrote:

I recorded this up along Pearl Court, just over the border in Ramsey, on Saturday.

One of the many calls this makes.

What is it?  My apologies in advance...

I hope it plays on your device.

Will post a photo later in the week.

Download Pearl Ct 2(1)

Here's the photo above, with the product's name erased. Like a mockingbird, this device breaks into a variety of calls.

What's the product? And what is it used for?