Take a look at this picture and find it somewhere near to your door, make sure you are from inside the door. Yes, that is EXIT PUSH BUTTON.

Exit Button

You just need to push or press at the center area and the door will open for you immediately. In normal condition or area open to public, this Exit Push Button will be installed beside your card reader (from inside) and will give convenience to your visitor or anyone to exit from your door.
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Tags: access control, button, door access, Exit Button, push button