Ring Health Tracker for Women Men, Fitness Ring with Heart Rate,Blood Oxygen,Sleep Monitor,Calories, Step Counter, IP68 Waterproof Smart Ring for iPhone & Android, No Subscription Fee (Silver, 10#)

✨【Size Before You Buy】The Tiantianka Smart Ring follows US ring sizing standards. If you know your US ring size, simply order the same size for a perfect fit. If you’re unsure of your size, we recommend getting our Tiantianka Sizing Kit to find your ideal fit for maximum comfort.