About this interactive
Keys work well for a home, a locking cabinet or a laptop lock. For most business doors they are not a great solution: they can be lost, stolen or copied, locks can be picked or opened with a bump key, and some keys open more than one door.
A key fob or a badge is tapped on a reader, and the reader grants or denies entry by whether that person is allowed in that area. The lesson gives two advantages over a key. The system tracks who went in, and one person's access can be removed, or given for a while and then taken away, without touching anyone else's.
So a key is fine where one person or household holds it, nothing has to be recorded, and nobody's access will need to end. Once you need to know who went in, to limit who may open a door and when, or to cut off one person, a badge or fob fits.
To sort a card, ask whether the door ever needs tracking or revoking.
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