I think if there are PA speakers, the system is tied in with the PA system. I’ve seen plenty of places, including some Targets, where there are PA speakers, pulls, keypads, etc, but no NAs.
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We do have a PA system, I don’t know what the PA system is but you could be right about it. Does anyone know if Bosch has Voice Evac? I do remember the store having an older PA system that had a 480HZ chime tone, does anyone know what PA uses a chime with that frequency or close to that frequency?