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

“You shall have breakfast instantly,” said Bellingham, touching an annunciator, and awakening a distant electric titter somewhere.
The Minister’s Charge William Dean Howells

Far away was the night nurse’s desk, with its lamp, its annunciator, its pile of records.
K Mary Roberts Rinehart

It will be understood that, in practice, the bell is mounted on or at the annunciator, andp.
Electricity for Boys J. S. Zerbe

Each berth has a bell-rope communicating with a patented machine called the “annunciator.”
Harper’s New Monthly Magazine, Volume 1, No. 3, August, 1850. Various

“Enter,” said a pleasant baritone voice from the annunciator.
The Lani People J. F. Bone

Take out two or three screws and the annunciator opens, revealing a series of electro-magnets like the one shown in Fig. 35.
The Library of Work and Play: Electricity and Its Everyday Uses John F. Woodhull

The buzzing of the annunciator, a man’s voice aroused Ulick from his reverie.
Painted Veils James Huneker

The other end of this cable enters the elevator car and runs to the annunciator.
The Library of Work and Play: Electricity and Its Everyday Uses John F. Woodhull

The clock had struck the three-quarters when they heard the annunciator tinkle followed by the opening of the front door.
Blacksheep! Blacksheep! Meredith Nicholson

Her horsy face, under a curling net, looked out of the annunciator plate.
The Syndic C.M. Kornbluth

noun
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
a device giving an audible signal indicating the position of a train
a less common word for announcer