This advertisement speaks for itself - literally. When readers of the Times of India opened their morning paper, an audio chip placed within the pages produced its advertisement as soon as the photodiode that powered the chip was exposed the light.
Listen to the ad in this short video.
(Volkswagen newspaper ad)
Fans of author Greg Bear recall the speaker chips used for advertisements in books in his 2003 novel Darwin's Children:
Without thinking, Kaye turned right and found herself in the religious section. Most of the shelves were filled with brightly colored apocalypse novels...
Most of the books had speaker chips that could read out the entire story. The same chips replaced jacket copy with vocal come-ons. The shelves murmured softly in a wave, like ghosts triggered by Kaye's brief passage.
Will Whales Be Our First Contact?
'He had piloted the Adastra to its first contact with the civilization of another solar system.' - Murray Leinster, 1935.
Technovelgy (that's tech-novel-gee!)
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A System To Defeat AI Face Recognition
'...points and patches of light... sliding all over their faces in a programmed manner that had been designed to foil facial recognition systems.'
Smart TVs Are Listening!
'You had to live -- did live, from habit that became instinct -- in the assumption that every sound you made was overheard...'