"Recently moved into a older house, there are 2 of these "outlets" in the house with this weird device behind them, what is this thing?"

🔔 The circuit broke—and the alarm sounded.

No contact.

No pressure plates.

Just a silent, invisible tripwire made of light.

It was simple.

It was brilliant.

And for its time—revolutionary.

🏡 Where You’ll Find These Hidden Devices

These systems were installed in both homes and businesses, especially where security mattered:

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