A public address system or loudspeaker.

After a major manufacturer of public-address systems: The term ‘tannoy’ is often used generically in colloquial English throughout the British Commonwealth to mean any public-address system or even as a verb – to “tannoy”, particularly those used for announcements in public places; although the word is a registered trademark, it has become a genericised trademark.

A moment later, the maid who had attended Miriam Bancroft earlier came up the steps to the balcony bearing a tray with a visibly chilled decanter and tall glasses. Bancroft was wired with internal tannoy like everyone else at Suntouch House, it seemed.

Definition from Wiktionary, Creative Commons Attribution/Share-Alike License (via Wordnik); additional verbiage from Wikipedia

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