4M Magnetic Alarm
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.
- Age: 5 years and up
- Approx Package Dimensions: 22 x 17 x 6 cms
- Build your own Intruder Alarm
- Keep out those pesky brothers & sisters
- Requires 2 AAA batteries (not included).