Black gen 3 Oura ring in a size 10. Purchased December 2022. Oura ring sizing is not standard, I usually wear an 8.5 or 9. Ring has scratches (can be seen in photos) still works perfectly, comes with charger but no charging cord (standard usb c). I don’t use the ring anymore. It tracks your heart rate, temperature and movement to assess your level of activity and sleep patterns. Temperature can be used to predict periods. Retail $299