What is this device?

π•Έπ–”π–˜π–˜@infosec.pub to Asklemmy@lemmy.ml – 49 points –

This was inside the bill of a baseball cap with the word "MARINES" on the front. I tried changing the batteries, but it doesn't seem to be doing anything. Does anyone know what this is?

It has a button on one side. But new batteries didn't reveal it's purpose. I'm thinking it's too corroded now to work. I know that round thing is a simple speaker or buzzer, but I don't know (a) what sound it's intended to make and (b) why it was sewn into the bill of a baseball cap.

Internals, image 1:

Internals, image 2:

External, backside:

Cap pictures:

Edit: added images of the internals.

Edit 2: added a small description of the button, and why I didn't just test it with new batteries (I did, but it doesn't work). So, basically, all I know.

Edit 3: added a picture of the backside of the casing.

Edit 4: Adding pictures of the cap itself.

Thank you, everyone, for all of your input. If I'm ever able to get this thing working, I'll add a video of the device and it's audio.

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From the other comments, it could be a novelty hat that speaks or makes a sound effect when the button is pressed. I’m curious to find out what the original sound would have been!

Quick question: Where does the battery go? Is it the corroded part in the first internals image, or was that the button?

Batteries go in the two steel rectangular holders. The corroded thing is the button (it's a flexible sheet of metal held in place by plastic) The golden disk is a piezoelectric buzzer (think musical greeting cards, which look just like this does inside)