an announcer.
a signaling apparatus, generally used in conjunction with a buzzer, that displays a visual indication when energized by electric current.

1745–55; annūntiātor; see annunciate, -tor

annunciatory [uh-nuhn-see-uh-tawr-ee, -tohr-ee] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
annunciator (əˈnʌnsɪˌeɪtə)
1.  a device that gives a visual indication as to which of a number of electric circuits has operated, such as an indicator in a hotel showing in which room a bell has been rung
2.  a device giving an audible signal indicating the position of a train
3.  a less common word for announcer

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
If an annunciator shows any location-related information that is not obvious, a
  graphic diagram should be provided.
Call for an on site location approval of master box and annunciator.
Functionally test temperature alarms and annunciator points.
Revise legend to include graphic and identifier of fire alarm annunciator.
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