Smart Ring,Fitness Tracker Ring for Men/Women,Ultra Thin Smart Rings with Calories/Heart Rate/Blood Oxygen/Sleep Monitoring,No Subscription Fee,5ATM Waterproof (Gold, Ultra Thin-9#)

Features

• Size Before You Buy: Please according to the wearing instructions on the details page, first measure your finger circumference, then calculate the inner diameter of your finger, find the corresponding ring size number and select it. ATTENTION: Wearing incorrect-size ring （too small or too big) will affect the accuracy of the APP data. Please choose the correct size.