what is ei

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Most locks will have a standard door range they will install on, but occasionally customers will want to use them on thicker doors.  In order to do so, the extended door thick...
Current exit alarm ALK released in November 2010 does ship standard with an EI (external inhibit) option.  ALK shipped prior to this would only have EI if ordered as a Special option.
The Falcon Exit Alarm option was updated in June 2012 to include the following benefits. Louder Alarm 95dbs vs 87dbs Easier battery changes 24Vdc hardwire(HW) option included w...