CIA @CIA
These Cold War-era intrusion detectors were designed to blend with the terrain. They can detect movement up to 300 meters away, are powered by tiny power cells, and have built-in antennae. Transmitters relay data from the device via coded impulses. https://t.co/B3MWl4rYDK https://t.co/XuuB2rFGct — PolitiTweet.org