The “Poor Man’s Perimeter Alarm ” These innocent looking little explosives have a 5″” pull string on each side of a 1.5 inch charge. When tied to a door, window or across a path , a loud 80 decibel bang will wake up even the soundest sleeper and alert you to an intruder.
Sometimes thinking outside of the box, you can find frugal solutions to supplement your existing security plan.

Additional uses: April Fool’s day, catching a teenage who is sneaking out/in and roommates who like to borrow your items.

Pulling Trick Fireworks

GE 50246 Smart Home Door Stop Alarm

GE 45117 Deluxe Wireless Door Alarm