A DIY trip wire alarm is any type of cordage connected to something that makes noise, alerting you to the presence of an intruder.

Safe to use .22 Cal Blanks available at any Home Depot or Amazon.com 100% Steel Construction made in the U.S.A. Featured product on Guns America website As seen on History Channel's "American Restoration"

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One man created a trip-wire alarm out of just a few items found in his junk drawer, and when triggered it can set stuff on fire!

Making a tripwire alarm system is easier than it seems at a first glance and it will notify you in case there is an emergency or an intruder near you.

The Sentry Alarm Mines Trip Wire Alarm can be used to protect individual items or large areas with just a trip wire or string...

Shotshell Primers 209 Trip Alarm* This outdoor necessity alerts you of any nearby movement with a tripwire-initiated alert system.

Extremely Easy and Safe Trip Wire!: THE EASY AND SAFE TRIP WIRE! Hi Everyone! This instructable will be easy to create, fun to play with, safe, and extremely inexpensive to create! I may post a laser trip-wire instructable in the future. There are hundreds …