Under the hood, PLAYBAR gets its punch from nine individually amplified speakers: six mid-woofers to deliver deep, rich low-frequency sounds, and three tweeters for crystal clear high-frequency detail.

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Quartz watches use very high-frequency oscillations of a crystal, which can be tuned with extreme precision to produce regular signals.

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The other, which faces a specialised type of solar cell made of a material called indium gallium arsenide, is sculpted into a structure called a photonic crystal that causes it to emit infra-red radiation selectively at the frequency best absorbed by the cell.

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For a more enjoyable calling experience it also uses age-specific frequency adjustment and real-time speech slowing to help make calls crystal clear.

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