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[PHOTO OF SEISMIC INTRUDER DETECTION DEVICE] 12k
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SEISMIC INTRUDER DETECTION DEVICE

This Cold War-era motion detector was designed to blend in with local terrain. It can detect movement of people, animals, or objects up to 300 meters. The device is powered by three mercury cells and has a built-in dipole antenna and built-in 150 MHz transmitter, which relays the device's findings through coded impulses.

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