https://en.wikipedia.org/wiki/Alarm_device
Security alarm
https://en.wikipedia.org/wiki/Security_alarm
"Strain -sensor cable installation" by United States Department of Army - FM 3-19.30: Physical Security. Licensed under Public Domain via Wikipedia - https://en.wikipedia.org/wiki/File:Strain_-sensor_cable_installation.jpg#/media/File:Strain_-sensor_cable_installation.jpg