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.\nIt’s a great project for exploring how a magnetic switch works in an electric circuit.\nSimple construction of the alarm box is required.\nRequires 2 x AAA batteries.\nAges 5 and over.