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The90 released a pendant-style necklace called The90 Gem with a built-in UV sensor that tracks UVA and UVB exposure in real time. The device pairs with a mobile app to provide personalized UV thresholds, sunscreen reminders, and sunlight guidance. It costs $299, with a $199 early access offer.

The Gem, a wearable from The90, uses a sensor to measure UVA and UVB exposure. The titanium-cased pendant comes in silver or gold and targets women initially, with plans for men's and children's versions. The battery lasts around an unspecified period.
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