Someone asked me what a FOB was. Here's a photo. A fob is a key ring token that contains a electronic circuit and radio transponder. When the fob is within a short distance of a reader, it transmits a number which identifies the holder and unlocks the door.
Each fob issued has a unique number. If lost, the fob number is deactivated and the holder can receive a replacement fob with a different number.
In contrast, lost keys usually require replacement of the locks to maintain security.
go to http://www.cardimaging.com/hid/pdfs/proxkey.pdf for details.
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