Doni Hormone, Cardio Tracking Smart Ring
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Smart rings are getting more sophisticated every generation. The latest ones can go beyond simply activity tracking. Take the Doni Ring for instance: it is a smart ring that offers medical grade cardio monitoring. It uses temperature, emotional modeling, and cycle data to quantify intimacy. It also uses PPG signals and AI to detect 7 motions and hormone levels.

This ring is also a very capable sleep tracker. It features Bluetooth 5.3 connectivity and lasts up to 6 days. Doni gives you feedback on fatigue severity, HRV, and sleep quality. It is 10ATM waterproof, so it is ready for your adventures. You can find this project on Kickstarter.
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