[Videos] 3 Perimeter Trip Wire Alarms
Two Videos, Three Alarms
No need to describe where and when you want to set perimeter trip wire alarms. You know. These two videos show three different options: two loud alarms and one bright light alert.
First Video: DIY Perimeter Trip Wire Alarm
The first video by the SensiblePrepper is a very DIY device. He uses inert surplus smoke effect tops and shot shell primers.
Listen carefully to primer placement cautions (loose fit, not tight). He also recommends checking with local ordinances (but of course).