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The 4M - KidzLabs - Magnetic Intruder Alarm is a great project for exploring how a magnetic switch works in an electric circuit.. 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.- Dimensions: H22cm x W6cm x D17cm- AGE: 5+- Kidzlabs. Igniting kids imaginationsKidz Labs Magnetic Intruder Alarm