When the alarm goes off - is there a speaker in this box ?

Near the Master Bath tub - How near ?

Service Access for CB - jacuzzi tub ??

Does this thing chime when a window or door is open .. take the cover off and look inside as my guess is that it is an Alarm Buzzer of some sort.

Posting per the ops response to my comments:

When the alarm goes off - is there a speaker in this box ?

The unit is an Alarm Buzzer - removing the cover will reveal a speaker .