Spy Science - Intruder Alarm

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Learn the science of connecting an electric circuit. Construct your own door buzzer and place it behind your door. Stop intruders from your room. It's cool and fun! Contains plastic platform and alarm casing, 1 set of plastic accessories, metal pegs, electric buzzer, electric wire, string for alarm trigger, and detailed instructions. 2 x AA batteries required (not included).

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$14.95

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