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Don't let anyone sneak into your room undetected! Build your own Intruder Alarm to keep out those pesky brothers & sisters! And while you are at it, explore how a magnet sets off this cool build-your-own intruder alarm.

It's a great project for exploring how a magnetic switch works in an electric circuit.

Simple construction of the alarm box is required.

Requires 2 x AAA batteries (not included)

Ages 5 and over.