R06 Smart Ring Men Women Heart Rate Blood Oxygen Monitor Fitness Sport Tracker Color:Black No.12 convenient for reading and studying

convenient for reading and studying

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R06 Smart Ring Men Women Heart Rate Blood Oxygen Monitor Fitness Sport Tracker Color:Black No.12 convenient for reading and studyingR06 Smart Ring Men Women Heart Rate Blood Oxygen Monitor Fitness Sport Tracker Note: 1. For best performance and accuracy, we recommend wearing the COLMI Ring on your index finger. If you prefer other fingers, the middle and ring fingers are also OK. Avoid fingers where the base is narrower than the knuckle. 2. The size of COLMI rings may not be completely in line with universal standards. Please measure your finger circumference before purchasing and