If you've ever worried that your bedroom's not safe from siblings or protected from parents, fear not! Construct your own intruder alarm using this top secret electronic security kit. Build the security buzzer and place it behind your door, and you'll instantly be alerted when anyone tries to enter your kingdom. Kit contains plastic platform and alarm casing, electric buzzer, wire and accessories. There's also a booklet to help you build it and give you some interesting info along the way.
Learn the science behind electric circuits
Everything you need to build the intruder alarm included
Detailed nstruction manual