What Is The Purpose Of Red LED On This Access Pushbutton?

I do not know why this red light is on/part of this lit 'Press To Exit' pushbutton. Do you?

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** *****, * ******* ******* ** was * ****/**** ********* ******* *** lock *** *********, *** **** *** light *** *** *** ****** **** regardless ** *** **** *** ***/********/*********.

**** *** **** ******** - *** red **** *** *** ********** ** whether *** **** *** **** ** closed.

******* **** *** ********* **** ******* having **** *** *** (***:****** ******* ******* ** **** (***) Tutorial), ** *** ** ** *****?

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*** *** ***** *** ******? ******** it's *** ***** ******** **-*-**, *** install ****** ****:

**-*-** ******

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** ***** ** ******* ****** **** up ******* ***** **** ***** ** it! * ***'* **** ******** ******* this ** **** *** ***** ** installing **** ******.

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***** ************ *** ** **** ********** with ******* ** *** ******* ** the *** *** *** ****** ******.

********** ***

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