Top Secret Intruder Alarm

This Science Museum kit makes an alarm you can install on any door. Opening the door pulls a trigger which completes a circuit, sounding the electronic alarm. The contents include a plastic intruder alarm case set with cover and base platform, battery holder with switch and wires installed, metal pegs, plastic pegs, trigger plate, wall mount, trigger plate holder, string, double adhesive tape, door plate and detailed instructions in full colour. Very smart gift for all those boys who want to keep their sister out of their room.

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