4M - KidzLabs - Spy Science Intruder Alarm
$29.95
Learn the science of connecting an electric circuit. Construct your own door buzzer and place it behind your door. It's cool and fun!17cm x 22cm x6...
$29.95
Learn the science of connecting an electric circuit. Construct your own door buzzer and place it behind your door. It's cool and fun!17cm x 22cm x6...