"It was stuck to my hoodie when I came home from grocery shopping. Seems to have two small batteries and some form of a button. It’s wired to a thin round metal plate. It was inside the plastic hull, I opened it so see what it is and to make the photos."
A: "The major component other than the PCB appears to be a piezoelectric buzzer. I imagine it’s a sound playing device out of a toy or Christmas jumper."
Someone having to ask about that makes me feel old, I recognized it immediately...
You wouldn't believe how many people I know who no longer have landlines, and there are younger people who've never had one in their home.
I pulled the landline out of my house back in 1996, lots of people been born since (not connected, lol)
Gravity cell