The Oura Ring Generation 3 (Gen3) is a smart ring that tracks health and activity data: -Tracks sleep, heart rate, blood oxygen, body temperature, and more -Provides daily scores for sleep, activity, and readiness Insights: Provides insights into chronotype, hormonal factors, and stress levels -May alert you when you're getting sick -Lightweight metal band with sensors on the inside -Comfortable to wear all day, doesn't catch on clothes, and doesn't buzz for notifications -USED; Selling because I was gifted the Gen4 Ring. I used this Gen3 Ring for about 2 months and absolutely love it. Has scratches; gold ring scratches easily.