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!
Only logged in customers who have purchased this product may leave a review.
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!
Only logged in customers who have purchased this product may leave a review.
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