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Introduction
For the safety or requirement of an industry, door always needs to be closed or else, it will risk intrusion, damage or loss of a product or an environment. For example, the storehouse storing valuable things, a server room where the temperature needs to be maintained, the dust-free rooms and etc. Hence, the clarity of knowing that the room is always need to be closed neatly is mandatory. By adding a buzzer or an alarm on the door, this purpose can be achieved.
