What does the BOCA feature mean on a M490DE?

BOCA: Some areas adhere to this life safety code for delayed egress. The nuisance delay is fixed at one second and
the delayed egress time at 15 seconds. After delayed egress has been initiated and the door opened, the alarm will
automatically reset after 30 seconds and the door will relock. If the door is opened within the 30 seconds the timer will
begin again.  A M490DEP includes the door position sensor required for the BOCA option.

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