It is made to limit the access of people getting in and out of the property. If you are into a business and you want to make sure that certain part of the building is secured, and you want to ensure that only authorized people will be permitted to get in a specific room, you definitely need the door controller. For some establishments like casino and pharmaceutical laboratories, owners must make sure that they use advanced door controllers.
http://www.rightworks.com/gadget-2/the-importance-of-having-a-door-controller/
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