Each kit contains a plastic platform and accessories, metal pegs, an electric buzzer, electric wire and string for the alarm trigger along with detailed instructions.
Requires 2 x AA batteries
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| 4M : Spy Science Intruder Alarm |
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Construct your own intruder detector buzzer for your bedroom door and learn about connecting electric circuits in the process! Each kit contains a plastic platform and accessories, metal pegs, an electric buzzer, electric wire and string for the alarm trigger along with detailed instructions. Requires 2 x AA batteries |