Tuesday, 8 September 2015

How Do The Doors In Malls Open By Themselves? | Kids Educational Videos

How Do Doors In Malls Open By Themselves? Magical Mechanism about Door In Malls. This is because sensor.Sensor sense thing around them like sound, light & weight.when someone near the door,the sensor sense a message to door & door is open & nobody around door,it will automatically close.Teach your kids Magical Mechanism.

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