4M - Magnetic Intruder Alarm
$28.95
$22.99
You Save $5.96!
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+
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