The Week contest — Wearable tech

Please invent another type of truly useful, wearable tech

True Love Tester
(Image credit: (YouTube Screenshot))

Last week's contest: A Japanese company has come up a high-tech bra called the True Love Tester that can only be unhooked when built-in heart-rate sensors detect true love. Please invent another type of useful, wearable tech.

RESULTS:

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