LâOreal followed this up last year with the first battery-free wearable electronic UV sensor. UV Sense is tiny enough to wear on a fingernail, pair of sunglasses, running shoes, etc. â essentially any item that is exposed to the sun. The little wearable changes colour to indicate UV levels and can connect to your phone via NFC to show exposure trends and tell you when its time to apply sun-screen.
Image source: Shade.
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