I could see a use for something like this. If you’re on night shift and you have a large area to keep track of, setting up a couple of these could help you to increase your coverage of an area. The best part, is the guy that trips it would not know he tripped it unless they had night vision optics. Cool stuff. –Matt
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Phoenix Junior Intruder Beacon
A trip switch activated, covert intrusion detection signaling beacon
Phoenix Jr. Intruder Beacon System (NSN: 5855-01-539-0639) is a trip wire activated infrared beacon used in conjunction with night vision equipment to detect and signal night movement along trails, roads and entry points.
The system consists of the trip wire unit, one reusable 50 ft. line bobbin, an Allen wrench used for winding the bobbins, two magnetic mounts and the Phoenix Jr. Intruder Beacon. The Phoenix Jr. Intruder Beacon flashes at a rate four times faster than the Phoenix Jr., thus differentiating it from the standard combat identification signal. Alternatively the trip wire unit may also be used with any Phoenix or Pegasus flashing beacon, and is available for purchase separately without the Phoenix Jr. Intruder beacon.