Worried someone might intrude on your evil lair? This DIY sonic tripware alarm is easy to build, decently loud, and is perfect for simple hide-and-seek games or establishing a perimeter around ...

“All Perimeter Intrusion Detection Systems are susceptible to false alarms caused by animals, weather and the movement of trees and foliage and it is critical that all PID manufacturers continuously ...

RBtec Perimeter Security Systems has released a brand new series of fence alarm processors, including 2 Zone Processor (LPU-402), 4 Zone Processor (LPU-404), and their new accessories. Featuring easy ...

Whether you’re trying to catch an intruder or give someone a good scare, you can build this simple tripwire alarm in only a few minutes. This post is part of our Evil Week series at Lifehacker, where ...

Instructables user [EngineeringShock] has been hard at work building a laser trip wire security system, complete with a combination lock. The security system works just like you see in the movies, ...

Sometimes security doesn’t need to be overly complex to be effective. Instructables user [1234itouch] recently built a simple laser tripwire alarm that can be mounted virtually anywhere, complete with ...